Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 26, 2016	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract]
Beginning balance, shares outstanding (in shares)		8,653,712
Shares granted, options (in shares)	1,600,000	150,000	1,600,000
Shares exercised (in shares)		(35,914)
Shares forfeited (in shares)		(223,573)
Ending balance, shares outstanding (in shares)		8,544,225	8,653,712
Exercisable shares (in shares)		6,914,225
Beginning balance, weighted average exercise price (usd per share)		$ 9.51
Options, grants in period, weighted average exercise price (usd per share)	$ 8.96	9.03
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		9.63
Shares forfeited in period, weighted average exercise price (usd per share)		9.45
Ending balance, weighted average exercise price (usd per share)		9.50	$ 9.51
Exercisable shares, weighted average exercise price (usd per share)		$ 9.63
Weighted Average Remaining Contractual Life (years)		6 years 1 month 9 days	7 years 21 days
Weighted Average Remaining Contractual Life (years) - Exercisable		6 years 7 months 17 days
Aggregate intrinsic value		$ 0	$ 7,805
Aggregate intrinsic value (exercisable options)		$ 0