Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000319815 (http://www.sec.gov/CIK)

Income Tax Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Income Tax Disclosure [Abstract]
Income (loss) before income tax, domestic and foreign	For financial reporting purposes, loss before income taxes includes the following components (in thousands):     Years Ended December 31,     2016   2015   2014 United States   $ (38,319 )   $ (35,074 )   $ (19,301 ) Foreign   18,759   17,344   17,375 Total   $ (19,560 )   $ (17,730 )   $ (1,926 )
Components of income tax expense (benefit)	The provision for income taxes based on loss before income taxes is as follows (in thousands):     Years Ended December 31,     2016   2015   2014 Federal:             Current   $ —   $ —   $ — Deferred   (11,360 )   (4,297 )   (5,608 )     (11,360 )   (4,297 )   (5,608 ) State:             Current   7   6   6 Deferred   923   62   853     930   68   859 Foreign:             Current   3,742   4,930   2,453 Deferred   561   8   1,944     4,303   4,938   4,397 Increase in valuation allowance   10,272   3,894   4,698 Tax provision   $ 4,145   $ 4,603   $ 4,346
Tax rate reconciliation	The primary components of such difference are as follows (in thousands):     Years Ended December 31,     2016   2015   2014 Taxes at federal statutory rate   $ (6,650 )   $ (6,028 )   $ (655 ) State taxes, net of federal benefit   (208 )   (236 )   (90 ) Effect of tax rate differential for foreign subsidiary   (2,985 )   (2,641 )   (3,570 ) Valuation allowance, including tax benefits of stock activity   10,272   3,894   4,698 Foreign taxes on unremitted earnings   1,204   2,085   1,590 Stock-based compensation   441   134   621 Foreign withholding taxes   260   180   — Return to provision adjustments   1,062   1,131   536 Subpart F income inclusion   906   5,914   1,167 Other   (157 )   170   49 Tax provision   $ 4,145   $ 4,603   $ 4,346
Deferred tax assets and liabilities	Items that give rise to significant portions of the deferred tax accounts are as follows (in thousands):     December 31,     2016   2015 Deferred tax assets:         Tax loss carryforwards   $ 62,994   $ 52,504 Tax credit carryforwards   19   19 Uniform capitalization, contract and inventory related reserves   598   1,558 Accrued vacation   514   592 Stock-based compensation   2,130   1,466 Capitalized research and development   5,532   6,212 Tax basis depreciation less book depreciation   1,661   1,019 Intangible assets   1,354   1,533 Deferred revenue   33   254 Accrued foreign taxes   1,263   1,271 Other   2,523   2,527 Total   78,621   68,955 Deferred tax liabilities:         Inventory deduction   (369 )   (235 ) Pension assets   (1,733 )   (1,173 ) Allowance for doubtful accounts   (677 )   (378 ) Withholding tax on undistributed earnings of foreign subsidiary   (4,879 )   (3,675 ) Unrealized gains and losses   (733 )   (984 ) Other   —   (1 ) Total   (8,391 )   (6,446 ) Net deferred tax assets before valuation allowance   70,230   62,509 Valuation allowance   (78,366 )   (68,093 ) Net deferred tax liabilities   $ (8,136 )   $ (5,584 )
Unrecognized tax benefits rollforward	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): Balance at December 31, 2014 $ 11,939 Increase in current period positions 1,466 Increase in prior period positions 609 Balance at December 31, 2015 14,014 Increase in current period positions 1,596 Increase in prior period positions 116 Decrease in prior period positions (147 ) Balance at December 31, 2016 $ 15,579