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Stock-Based Compensation - Summary of RSU Activity Under Plans (Details) - Equity Incentive Plan2010 [Member] - RSU's
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Number of Shares  
Non-vested shares at the beginning of the year | shares 376,000
Granted (in shares) | shares 60,000
Vested (in shares) | shares (133,000)
Cancelled (in shares) | shares (1,000)
Non-vested shares at the end of the period | shares 302,000
Weighted Average Grant-Date Fair Value  
Weighted average grant date fair value | $ / shares $ 1.58
Granted (in dollars per share) | $ / shares 1.16
Vested (in dollars per share) | $ / shares 2.11
RSUs cancelled and returned to Plan (in dollars per shares) | $ / shares 0.94
Weighted average grant date fair value | $ / shares $ 1.27