Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation and Other Benefit Plans - Additional Information (Details)

v3.8.0.1
Stock-Based Compensation and Other Benefit Plans - Additional Information (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock option activity | shares 0
2008 Warrant  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Remaining compensation expense to be recognized $ 0
2008 Stock Plan  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Total unrecognized compensation cost $ 1,100,000
Compensation cost recognized weighted average remaining period 2 years 4 months 2 days
2017 Stock Plan  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Total unrecognized compensation cost $ 223,000
Compensation cost recognized weighted average remaining period 4 years 10 days