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Stockholders' Equity and Employee Stock Option Plans RSU and RSA Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
RSU/ RSA Nonvested and outstanding opening balance, Number 331,163 64,714
RSU/ RSA Nonvested and Outstanding Opening balance, Weighted Average Grant Date Fair Value $ 5.74 $ 14.45
RSU/ RSA, Grants in Period 454,783 307,770
RSU/RSA, Grants in Period, Weighted Average Grant Date Fair Value $ 4.88 $ 5.21
RSU/RSA Vested in Period (136,928) (23,993)
RSU/ RSA Vested in Period, Weighted Average Grant Date Fair Value $ 6.22 $ 14.31
RSU/ RSA Forfeited in Period (93,112) (17,328)
RSU/RSA, Forfeitures, Weighted Average Grant Date Fair Value $ 5.31 $ 17.06
RSU/ RSA Nonvested and outstanding ending balance, Number 555,906 331,163
RSU/ RSA Nonvested and Outstanding Closing balance, Weighted Average Grant Date Fair Value $ 4.99 $ 5.74
Total fair value of RSUs vested and released $ 685 $ 118,000
RSU, Vested and Expected to Vest, Outstanding, Number 555,906  
RSU, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 3,100  
Share Price $ 5.54