Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (79,774)	$ (208,755)	$ (147,082)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of fixed assets	1,822	2,280	2,312
Amortization of intangible asset		15,223	27,442
Impairment of intangible asset			31,269
Write-down of inventory	1,654	385	2,274
Write-down of capitalized computer software development costs			62
Gain on purchase commitment			(243)
Loss on extinguishment of debt / conversion of debt		11,176	2,934
Write-off of deferred financing costs and debt discount		3,820	2,752
Amortization of deferred financing costs	509	1,304	1,290
Amortization of debt discount	2,297	3,118	3,867
Amortization of debt premium	(564)
Accretion of repayment premium on secured term debt			(345)
Share-based compensation	12,354	47,217	10,324
Gain on settlement of payable		(4,131)
Bad debt expense	3	6	5
Gain on deconsolidation of subsidiary			(24,000)
Change in fair value of financial instruments	(2,096)	(4,380)	(1,494)
Beneficial conversion feature expense on warrants		1,745
Beneficial conversion feature expense on convertible debt		44,170
Fair value of units issued to consultants		3,000
Fair value of shares / units issued in settlement of obligation		4,360	13,647
Accrued legal settlement			10,350
Deferred taxes	(437)	27	(3)
Paid-in-kind interest		14,695	11,434
Loss on equity method investment	7,599	13,625	2,776
Changes in operating assets and liabilities:
Restricted cash			(89)
Accounts receivable, net	21	937	(1,313)
Inventories, net	95	1,133	1,930
Prepaid expenses and other assets	(134)	(479)	597
Accounts payable	1,605	530	(4,413)
Accrued expenses, other liabilities and deferred rent	(4,652)	544	3,040
Deferred revenue	(4,400)	(4,500)	(10,300)
Net cash used in operating activities	(64,098)	(52,950)	(60,977)
Cash flows from investing activities:
Purchases of fixed assets	(479)	(539)	(161)
Net cash used in investing activities	(479)	(539)	(161)
Cash flows from financing activities:
Proceeds from issuance of common stock and warrants, net	95,954
Proceeds from issuance of ESPP shares	30
Proceeds from warrant exercises	37
Proceeds from issuance of common stock in IPO, net		69,750
Payments of initial public offering costs		(3,293)	(445)
Payment of financing costs related to debt exchange agreements		(534)
Proceeds from issuance of secured term debt			35,000
Proceeds from issuance of convertible debt			112,500
Payment of financing costs	(20)		(4,069)
Principal payments on secured term debt		(380)	(107,204)
Proceeds from related party loans			2,000
Repayment of related party loans		(3,000)	(2,000)
Proceeds from issuance of Class A units, net			15,000
Proceeds from issuance of Class E redeemable convertible units, net		5,500	10,833
Proceeds from exercise of stock options		41	30
Net cash provided by financing activities	96,001	68,084	61,645
Net increase in cash and cash equivalents	31,424	14,595	507
Cash and cash equivalents, beginning of period	36,093	21,498	20,991
Cash and cash equivalents, end of period	67,517	36,093	21,498
Supplemental cash flow disclosures:
Cash paid for interest	3,689	3,723	8,019
Cash paid for taxes	356	339	153
Non-cash investing and financing activities:
Settlement of related party loan			500
Units issued in settlement of obligation		11,725	9,063
Capitalized lease obligations	208	230	20
Unpaid financing/offering costs		56	1,958
Equity method investment related to deconsolidation			24,000
Financing costs paid with convertible notes			2,260
Fair value of warrants issued to lenders			$ 6,300
Cost Method Investment in affiliate		1,242
Beneficial conversion feature on convertible preferred stock	384	7,660
Accretion of dividends on convertible preferred stock	1,534	642
Beneficial conversion feature on Class E units at IPO		13,431
Conversion of Class E units into common stock		(83,626)
Conversion of convertible debt into common stock		176,615
Conversion of convertible debt into convertible preferred stock		30,000
Reclassification of warrants from liabilty to equity		1,716
Fair value of warrants issued in private placement	1,651
Fair value of modification to lender warrants	$ 908
Class E Redeemable Convertible Units [Member]
Cash flows from financing activities:
Proceeds from issuance of Class E redeemable convertible units, net		5,500
Non-cash investing and financing activities:
Conversion of Class E units into common stock		$ 83,628