Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 899	$ (12,825)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	11,924	12,479
Provision for doubtful accounts, notes and inventory	166	300
Stock-based compensation expense	1,054	1,246
Change in fair value of derivative instruments	(5,227)	6,584
Amortization of discount and debt issuance cost	(85)	(150)
Gain on disposal of property and equipment	(14)	(2,680)
Gain from sale of certain assets of subsidiary	(176)
Loss (income) from equity method investments	(145)	467
Right-of-use asset amortization	676	652
Deferred income taxes	30
Changes in operating assets and liabilities, net of assets and liabilities acquired and disposed:
Accounts and other receivables	(180)	(5)
Inventory	51	2,023
Prepaid expenses and other assets	(2,682)	(94)
Operating lease liabilities	(851)	(777)
Accounts payable	(5,594)	(1,208)
Deferred revenue	(2,437)	(3,485)
Accrued expenses and other	(1,667)	(10,756)
Net cash used in operating activities	(4,258)	(8,229)
Cash flows from investing activities:
Purchases of short-term investments	(29,284)	(26,659)
Maturities and sales of short-term investments	56,500	26,396
Purchases of and deposits on property and equipment	(3,658)	(4,316)
Loans made to customers	(40)
Payments on and proceeds from sales of loans receivable	609	141
Cash received from sale of certain assets of subsidiary, net	5,628	5,114
Proceeds from disposal of property and equipment	685	4,388
Net cash provided by investing activities	30,440	5,064
Cash flows from financing activities:
Issuances of common stock	194	175
Repurchase of common stock	(4,244)
Fees paid for issuances of common stock and debt issuance costs	0	(15)
Proceeds from debt instruments	200	3,394
Repayments of debt instruments and finance lease obligations	(1,700)	(1,475)
Net cash provided by (used in) financing activities	(5,550)	2,079
Effect of exchange rates on cash, cash equivalents, and restricted cash	(328)	73
Net increase (decrease) in cash, cash equivalents and restricted cash	20,304	(1,013)
Cash, cash equivalents and restricted cash, beginning of period	53,222	34,624
Cash, cash equivalents and restricted cash, end of period	73,526	33,611
Supplemental disclosure of cash flow information:
Income taxes paid	29
Interest paid, net of $80 and $98 capitalized, respectively	$ 2,104	$ 1,756