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Stock-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of Options  
Beginning balance, options outstanding (in shares) | shares 2,207,409
Granted (in shares) | shares 98,184
Expired (in shares) | shares (1,461)
Ending balance, options outstanding (in shares) | shares 2,304,132
Weighted average exercise price per share  
Beginning balance, options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 8.09
Granted, weighted average exercise price (in dollars per share) | $ / shares 2.33
Expired, weighted average exercise price (in dollars per share) | $ / shares 15.00
Ending balance, options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 7.84
Additional Disclosures  
Options exercisable (in shares) | shares 1,548,216
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 9.04
Options outstanding, weighted average remaining contractual term (in years) 7 years 7 months 6 days
Options exercisable, weighted average remaining contractual term (in years) 6 years 10 months 24 days