Equity - Restricted Stock Awards (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services performed (in shares)			17,539	43,344
Shares issued for services performed			$ 166,000	$ 346,000
Share-based Compensation [Abstract]
Share-based compensation expense	$ 5,306,000	$ 4,701,000	15,232,000	13,826,000
Cost of sales
Share-based Compensation [Abstract]
Share-based compensation expense	119,000	109,000	393,000	300,000
Research and development
Share-based Compensation [Abstract]
Share-based compensation expense	148,000	159,000	425,000	520,000
Selling, general and administrative
Share-based Compensation [Abstract]
Share-based compensation expense	$ 5,039,000	$ 4,433,000	$ 14,414,000	$ 13,006,000
Restricted stock awards
Number of Shares
Unvested, Beginning Balance (in shares)			3,828,445
Granted (in shares)			3,041,078
Vested (in shares)			(1,457,449)
Forfeited (in shares)			(283,198)
Unvested, Ending Balance (in shares)	5,128,876		5,128,876
Weighted- Average Grant Date Fair Value
Unvested, Beginning Balance (in dollars per share)	$ 8.97		$ 8.97		$ 8.97	$ 8.53
Granted (in dollars per share)			9.23
Vested (in dollars per share)			8.42
Forfeited (in dollars per share)			8.67
Unvested, Ending Balance (in dollars per share)	$ 8.97		$ 8.97
Total unrecognized stock-based compensation related to time-based, nonvested restricted stock					$ 32,910,620
Expenses expected to be recognized over a weighted-average period (in years)			2 years 15 days
Common Stock | Consultant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services performed (in shares)			17,539
Shares issued for services performed			$ 166,000