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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenue, net $ 16,570 $ 17,111 $ 46,040 $ 45,818
Cost of revenue (1) [1] 8,292 8,545 23,561 21,596
Gross profit 8,278 8,566 22,479 24,222
Operating expenses:        
Research and development (2) [2] 6,145 6,634 18,568 18,906
Selling, general and administrative (3) [3] 3,334 3,900 10,805 11,658
Total operating expenses 9,479 10,534 29,373 30,564
Loss from operations (1,201) (1,968) (6,894) (6,342)
Interest expense and other, net (105) (123) (317) (375)
Loss before income taxes (1,306) (2,091) (7,211) (6,717)
Provision (benefit) for income taxes (63) 209 192 472
Net loss $ (1,243) $ (2,300) $ (7,403) $ (7,189)
Net loss per share - basic and diluted (in usd per share) $ (0.05) $ (0.10) $ (0.31) $ (0.32)
Weighted average shares outstanding - basic and diluted (in shares) [4] 25,735 23,007 24,210 22,629
[1] Includes: Stock-based compensation 52 61 147 191 Additional amortization of non-cancelable prepaid royalty (14) 4 (14) 95
[2] Includes: Stock-based compensation 524 562 1,442 1,801
[3] Includes: Stock-based compensation 443 634 1,401 1,909
[4] The increase in shares from the 2014 periods to the 2015 periods is due primarily to the weighted average effect of the sale of 3,738 shares of common stock in an underwritten registered offering during August 2015.