CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive (Loss) Income
Total
Balance at Dec. 31, 2012     $ 12,988 $ (105,587) $ (4) $ (92,603)
Balance (in shares) at Dec. 31, 2012 2,490,870          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)       3,503   3,503
Other comprehensive income (loss)         15 15
Stock-based compensation     3,760     3,760
Issuance of common stock options in connection with a business acquisition     174     174
Conversion of redeemable convertible preferred stock into common stock $ 2   116,311     116,313
Conversion of redeemable convertible preferred stock into common stock (in shares) 15,293,960          
Issuance of common stock, net of issuance costs     65,556     65,556
Issuance of common stock, net of issuance costs (in shares) 4,600,000          
Reclassification of redeemable convertible preferred stock warrant liability upon conversion to common stock warrant           1,310
Issuance of common stock upon net exercise of common stock warrants (in shares) 293,232          
Reclassification of redeemable convertible preferred stock warrant liability upon conversion to preferred stock     1,310      
Issuance of common stock upon exercise of stock options     446     446
Issuance of common stock upon exercise of stock options (in shares) 107,042          
Balance at Dec. 31, 2013 $ 2   200,545 (102,084) 11 98,474
Balance (in shares) at Dec. 31, 2013 22,785,104          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)       8,156   8,156
Other comprehensive income (loss)         (171) (171)
Excess tax benefit from exercise of options for common stock     91     91
Stock-based compensation     5,341     5,341
Issuance of common stock upon net exercise of common stock warrants     6,411     6,411
Issuance of common stock upon net exercise of common stock warrants (in shares) 7,763          
Issuance of common stock upon exercise of stock options (in shares) 1,512,514          
Balance at Dec. 31, 2014 $ 2   212,388 (93,928) (160) 118,302
Balance (in shares) at Dec. 31, 2014 24,305,381          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)       (1,652)   (1,652)
Other comprehensive income (loss)         (579) (579)
Stock-based compensation     7,034     7,034
Issuance of common stock upon exercise of stock options     1,360     1,360
Issuance of common stock upon exercise of stock options (in shares) 285,387          
Repurchase of common stock for treasury   $ (9,020)       (9,020)
Repurchase of common stock for treasury (in shares) (1,154,480) 1,154,480        
Balance at Dec. 31, 2015 $ 2 $ (9,020) $ 220,782 $ (95,580) $ (739) $ 115,445
Balance (in shares) at Dec. 31, 2015 23,436,288 1,154,480