STOCKHOLDERS' EQUITY - Common Stock and Warrants Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Mar. 06, 2017	Feb. 24, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Payments for the termination of warrants			$ 54,808	$ 0
Proceeds from issuance of warrants			$ 57,244	$ 0
Common Stock Warrant
Class of Stock [Line Items]
Payments for the termination of warrants		$ 54,800
Warrants canceled (in shares)		9,456,955
Warrants to purchase aggregate shares of capital stock (in shares)	19,200,000
Warrants, weighted average exercise price (in USD per share)	$ 31.17
Proceeds from issuance of warrants	$ 57,200
Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			1,000,000,000		1,000,000,000
Common stock, par value (in USD per share)			$ 0.0000001		$ 0.0000001
Common stock, shares outstanding (in shares)			228,107,488		198,746,620
Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			500,000,000		500,000,000
Common stock, par value (in USD per share)			$ 0.0000001		$ 0.0000001
Common stock, shares outstanding (in shares)			145,258,328		165,800,756