Equity-Based Compensation - Activity Related to Plans (Details) $ in Millions	1 Months Ended		6 Months Ended
	May 31, 2017 shares	Feb. 28, 2017 shares	Jun. 30, 2017 USD ($) plan shares
Equity compensation plans
Number of equity compensation plans | plan			4
Stock Options
Stock Options
Outstanding at beginning of period (in shares)			3,113,178
Granted (in shares)			713,917
Exercised (in shares)			(17,590)
Expired or terminated (in shares)			(262,378)
Outstanding at end of period (in shares)			3,547,127
Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of year (in shares)			936,954
Granted (in shares)			786,576
Vested (in shares)			(376,745)
Expired or terminated (in shares)			(134,693)
Outstanding at end of year (in shares)			1,212,092
2007 Equity Plan
Equity compensation plans
Additional common stock for issuance (in shares)	2,485,000
2007 Equity Plan | Stock Options
Stock Options
Outstanding at beginning of period (in shares)			2,158,822
Granted (in shares)			685,817
Exercised (in shares)			(17,590)
Expired or terminated (in shares)			(202,472)
Outstanding at end of period (in shares)			2,624,577
2007 Equity Plan | Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of year (in shares)			773,804
Granted (in shares)			779,776
Vested (in shares)			(332,417)
Expired or terminated (in shares)			(126,374)
Outstanding at end of year (in shares)			1,094,789
2007 Equity Plan | Performance Restricted Stock Units (RSUs)
Restricted Stock Units
Granted (in shares)		191,250
Award vesting period (in years)		3 years
Maximum shares of common stock that may be issued (in shares)			173,250
Fair value, performance- based RSUs | $			$ 3.4
Compensation expense, period for recognition (in years)			3 years
2000 Equity Plan | Stock Options
Stock Options
Outstanding at beginning of period (in shares)			5,200
Granted (in shares)			0
Exercised (in shares)			0
Expired or terminated (in shares)			0
Outstanding at end of period (in shares)			5,200
2000 Equity Plan | Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of year (in shares)			0
Granted (in shares)			0
Vested (in shares)			0
Expired or terminated (in shares)			0
Outstanding at end of year (in shares)			0
2013 Lumara Equity Plan | Stock Options
Stock Options
Outstanding at beginning of period (in shares)			134,181
Granted (in shares)			0
Exercised (in shares)			0
Expired or terminated (in shares)			(1,031)
Outstanding at end of period (in shares)			133,150
2013 Lumara Equity Plan | Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of year (in shares)			27,694
Granted (in shares)			0
Vested (in shares)			(12,831)
Expired or terminated (in shares)			(501)
Outstanding at end of year (in shares)			14,362
Inducement Grants | Stock Options
Stock Options
Outstanding at beginning of period (in shares)			814,975
Granted (in shares)			28,100
Exercised (in shares)			0
Expired or terminated (in shares)			(58,875)
Outstanding at end of period (in shares)			784,200
Inducement Grants | Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of year (in shares)			135,456
Granted (in shares)			6,800
Vested (in shares)			(31,497)
Expired or terminated (in shares)			(7,818)
Outstanding at end of year (in shares)			102,941