Stock-Based Compensation - Stock Options (Details) - 2014 Plan - Stock options $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares
Options
Balance (in shares) | shares		1,637,399
Granted (in shares) | shares		120,000
Balance (in shares) | shares	1,757,399	1,757,399
Weighted Average Grant Date Fair Value
Balance (in dollars per share)		$ 6.47
Granted (in dollars per share)		5.50
Balance (in dollars per share)	$ 6.40	6.40
Weighted average exercise price per share
Balance (in dollars per shares)		10.49
Granted (in dollars per shares)		8.35
Balance (in dollars per shares)	$ 10.34	$ 10.34
Additional disclosures
Expected stock based compensation expense | $	$ 8.5	$ 8.5
Contractual term		2 years 9 months 22 days
Options exercisable (in shares) | shares	415,029	415,029
Options exercisable grant date fair value (in dollars per share)	$ 3.98	$ 3.98
Stock options expected to vest (in shares) | shares	1,342,370	1,342,370
Assumptions and Methodology
Expected volatility (as a percent)	77.00%
Minimum risk-free interest rate (as a percent)	1.43%
Maximum risk-free interest rate (as a percent)	1.62%
Dividend yield (as a percent)	0.00%
Minimum
Assumptions and Methodology
Expected term (in years)	5 years 6 months
Maximum
Assumptions and Methodology
Expected term (in years)	6 years 3 months
Board of Directors
Options
Granted (in shares) | shares	120,000
Additional disclosures
Vesting period	1 year
Employees
Additional disclosures
Vesting percentage		25.00%
Vesting period		3 years