CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (6,824)	$ (6,978)	$ 1,991	$ (2,424)	$ (13,802)	$ (433)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation					12,177	10,352
Loss on disposal of assets					263	404
Loss on extinguishment of debt	1,400		1,018		1,400	1,018	$ 1,400
Loss on termination of cash flow hedge	3,506		0		3,506	0
Amortization of intangibles	2,500		2,500		4,919	5,102
Amortization of debt issue costs					112	250
Amortization of convertible debt discount					864	0
Non-cash stock-based compensation					4,821	4,452
Non-cash operating lease expense					4,113	2,218
Changes in assets and liabilities, net
Accounts receivable, net					6,498	(13,178)
Inventories					(6,688)	(83)
Prepaid and other assets					(5,282)	(383)
Prepaid lease asset					(6,084)	0
Other current assets					(693)	(1,897)
Accounts payable, accrued and other liabilities					(11,175)	(6,446)
Net cash (used in) provided by operating activities					(5,051)	1,376
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment					(9,734)	(6,637)
Business acquisition					(37,000)	0
Acquisition working capital adjustment					0	399
Investment in non-consolidated affiliate					(13,137)	0
Net cash used in investing activities					(59,871)	(6,238)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of revolving credit facility					0	(5,000)
Repayment of equipment financing obligations					(3,059)	(3,644)
Proceeds from term loan					0	100,000
Repayment of term loan					(97,540)	(96,750)
Cash flow hedge termination					(3,317)	0
Payments of debt issuance costs					0	(954)
Issuance of common stock, net					5,469	8,061
Proceeds from issuance of convertible debt, net of issuance costs					194,376	0
Proceeds from equity offering, net of issuance costs					127,288	160,774
Net cash provided by financing activities					223,217	162,487
Net change in cash, cash equivalents and restricted cash					158,295	157,625
Cash, cash equivalents and restricted cash, beginning of period		$ 173,016		$ 9,811	173,016	9,811	9,811
Cash, cash equivalents and restricted cash, end of period	331,311		167,436		331,311	167,436	173,016
Cash and cash equivalents	295,281		167,436		295,281	167,436	173,016
Restricted cash, non-current	$ 36,030		$ 0		36,030	0	$ 0
Supplemental disclosure of cash flow information:
Interest paid					1,562	3,178
Income taxes paid, net					89	235
Supplemental disclosure of non-cash investing and financing information:
Working capital adjustment related to acquisition					0	1,977
Equipment acquired under financing obligations					428	2,702
Property and equipment included in accounts payable					$ 2,487	$ 970