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

Reporting Entity [Axis]

0001162194 (http://www.sec.gov/CIK)

Balance Sheet Related Disclosures [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Balance Sheet Related Disclosures [Abstract]
Summary of cash and cash equivalents	Cash and cash equivalents consisted of the following as of December 31, 2016 and 2015 (in thousands):       December 31, Cash and cash equivalents:   2016   2015 Cash   $ 13,984   $ 17,889 Money market funds   21,061   11,228 Total   $ 35,045   $ 29,117
Inventories	Inventories consisted of the following as of December 31, 2016 and 2015 (in thousands):       December 31, Inventories:   2016   2015 Raw materials   $ 8,919   $ 6,829 Work-in-process   1,742   2,442 Finished goods   9,453   8,653 Total inventories, net   $ 20,114   $ 17,924
Property and equipment	Property and equipment consisted of the following as of December 31, 2016 and 2015 (in thousands):     December 31, Property and equipment:   2016   2015 Computer equipment and software   $ 5,497   $ 5,048 Laboratory and manufacturing equipment   23,670   21,783 Leasehold improvements   8,747   5,875 Office furniture and fixtures   2,084   1,584 Property and equipment, gross   39,998   34,290 Less accumulated depreciation and amortization   (24,084 )   (19,618 ) Construction-in-progress   611   586 Property and equipment, net   $ 16,525   $ 15,258
Activity of warranty accrual	Activity for our warranty accrual for the years ended December 31, 2016 and 2015, which are included in other accrued liabilities, is summarized below (in thousands):     Year Ended December 31,     2016   2015 Beginning balance   $ 1,076   $ 1,178 Accrual for current period warranties   885   672 Warranty costs incurred   (938 )   (774 ) Ending balance   $ 1,023   $ 1,076