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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net loss $ (6,160) $ (4,889)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,139 2,285
Stock-based compensation 1,971 2,644
Reversal of uncertain tax positions (209) (270)
Deferred income tax expense 0 160
Other 52 44
Changes in operating assets and liabilities:    
Accounts receivable, net (85) 637
Inventories 23 (1,356)
Prepaid expenses and other current and long-term assets, net (144) 1,770
Accounts payable (813) 1,066
Accrued current and long-term liabilities 1,192 6
Income taxes payable 184 245
Net cash provided by (used in) operating activities (1,850) 2,342
Cash flows from investing activities:    
Purchases of property and equipment (533) (2,196)
Purchases of licensed technology (55) 0
Net cash used in investing activities (588) (2,196)
Cash flows from financing activities:    
Payments on asset financings (1,422) (1,037)
Proceeds from issuances of common stock 366 991
Net cash used in financing activities (1,056) (46)
Net increase (decrease) in cash and cash equivalents (3,494) 100
Cash and cash equivalents, beginning of period 17,926 20,805
Cash and cash equivalents, end of period $ 14,432 $ 20,905