Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Restricted Stock Award Activity (Details)

v3.10.0.1
Stock-Based Compensation - Restricted Stock Award Activity (Details) - Restricted shares of common stock
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Number of Shares (in shares):  
Non-vested, beginning balance (in shares) | shares 91,000
Vested (in shares) | shares (21,000)
Cancelled (in shares) | shares (23,000)
Non-vested, ending balance (in shares) | shares 47,000
Weighted-Average Grant Date Fair Value (in dollars per share):  
Non-vested, beginning balance (usd per share) | $ / shares $ 4.21
Vested (usd per share) | $ / shares 4.10
Cancelled (usd per share) | $ / shares 6.66
Non-vested, ending balance (usd per share) | $ / shares $ 3.08