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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (7,403) $ (7,189)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,225 3,415
Stock-based compensation 2,990 3,901
Reversal of uncertain tax positions (323) (270)
Deferred income tax expense 0 160
Other 42 35
Changes in operating assets and liabilities:    
Accounts receivable, net (86) (1,363)
Inventories (613) (765)
Prepaid expenses and other current and long-term assets, net 25 2,065
Accounts payable (94) 1,863
Accrued current and long-term liabilities 83 (438)
Income taxes payable 132 360
Net cash provided by (used in) operating activities (2,022) 1,774
Cash flows from investing activities:    
Purchases of property and equipment (2,544) (2,597)
Purchases of licensed technology (55) 0
Net cash used in investing activities (2,599) (2,597)
Cash flows from financing activities:    
Net proceeds from equity offering 16,356 0
Payments on asset financings (1,627) (1,960)
Proceeds from issuance of common stock under employee equity incentive plans 990 1,293
Net cash provided by (used in) financing activities 15,719 (667)
Net increase (decrease) in cash and cash equivalents 11,098 (1,490)
Cash and cash equivalents, beginning of period 17,926 20,805
Cash and cash equivalents, end of period $ 29,024 $ 19,315