Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net loss	$ (340,955)	$ (184,123)
Adjusted for the following items:
Inventory valuation adjustments	2,062	4,044
Depreciation and amortization expenses	4,908	4,561
Impairment of assets		29,839
Stock-based compensation expenses	7,193	7,677
Change in fair value of warrant liability	263,201	71,978
Loss from equity method investments	1,787	1,748
(Gain) loss from equity investments measured at fair value	(300)	1,534
(Gain) loss from sale of investment	(75)	65
Interest on debt securities		(221)
Deferred taxes	(635)	(1,272)
Amortization of discount on convertible notes	1,653	2,597
Amortization of transaction costs on Senior Facility	436	131
Foreign currency (gain) loss	(699)	28,069
Accretion related to obligations under finance leases	485	151
Issuance costs on registered offering recorded to net loss		3,953
Credit loss expenses	805	46
Provision for sales returns	(924)	(262)
Loss on disposal of property and equipment	82	457
Other non-cash items		138
Changes in non-cash working capital:
Accounts receivable	(1,000)	(1,906)
Inventory	(4,893)	(11,594)
Prepayments and other current assets	2,703	6,749
Accounts payable	30,513	(15,218)
Accrued expenses and other current liabilities	20,645	(3,172)
Net cash used in operating activities	(13,008)	(54,031)
Investing activities
Change in deposits and other assets		(927)
Investment in equity method investees	(493)
Proceeds from the sale of other investments	2,719	437
Purchases of property and equipment	(2,466)	(18,290)
Proceeds from disposal of property and equipment	171	661
Net cash used in investing activities	(69)	(18,119)
Financing activities
Proceeds from at-the-market equity offering, net of costs	156,029	27,027
Proceeds from ABG Profit Participation Arrangement		1,353
Proceeds from issuance of registered offering, net of issuance costs		85,465
Payment of ABG finance liability	(375)	(1,000)
Proceeds from exercise of warrants	76,106
Proceeds from exercise of stock options	6,117	1,813
Payment of obligations under finance lease		(105)
Payment on the settlement of stock options	(2,487)	(748)
Proceeds from issuance of Senior Facility, net of transaction costs		46,395
Repayment of Senior Facility	(1,309)	(414)
Net cash provided by financing activities	234,081	159,786
Effect of foreign currency translation on cash and cash equivalents	5,664	(10,437)
Increase (decrease) in cash and cash equivalents	226,668	77,199
Cash and cash equivalents, beginning of period	189,702	96,791
Cash and cash equivalents, end of period	$ 416,370	$ 173,990