Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Intangible assets, net of accumulated amortization	$ 0	$ 2,204
Debt discount	$ 18,088	$ 0
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	100,000,000
Common stock, shares issued (in shares)	44,058,626	43,898,785
Common stock, shares outstanding (in shares)	44,058,626	43,898,785