CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,710	$ 2,287
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	15,200	11,477
Loss on disposal of assets	451	278
Loss on extinguishment of debt	1,018	0
Amortization of intangibles	7,482	4,255
Amortization of debt issue costs	323	392
Non-cash stock based compensation	7,727	5,148
Non-cash operating lease expense	3,224
Changes in assets and liabilities, net
Accounts receivable, net	(14,219)	(2,267)
Inventories	(3,982)	644
Prepaid assets	(1,013)	(559)
Other current assets	(381)	(1,749)
Accounts payable, accrued and other liabilities	2,470	9,427
Net cash provided by operating activities	20,010	29,333
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(13,953)	(11,091)
Acquisition adjustment	399	0
Net cash used in investing activities	(13,554)	(11,091)
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on revolving credit facility	0	10,000
Repayment of revolving credit facility	(5,000)	(35,400)
Redemption of preferred stock	0	(50,096)
Repayment of equipment and other loans	(5,481)	(4,774)
Proceeds from term loan	100,000	30,000
Repayment of term loan	(96,750)	(3,187)
Payments of debt issue costs	(1,051)	(576)
Issuance of common stock, net	10,132	6,535
Proceeds from equity offering, net	160,774	134,910
Net cash provided by financing activities	162,624	87,412
Effects of foreign exchange rate changes on cash and cash equivalents	0	(35)
Net change in cash and cash equivalents	169,080	105,619
Cash and cash equivalents, beginning of period	9,811	12,821
Cash and cash equivalents, end of period	178,891	118,440
Supplemental disclosure of cash flow information:
Cash paid for operating lease liabilities	2,878
Interest paid	4,295	4,722
Income taxes paid (refunded), net	316	(76)
Supplemental disclosure of non-cash investing and financing information:
Working capital adjustment related to acquisition	1,977	0
Equipment acquired under loan obligations	3,665	7,569
Property and equipment included in accounts payable	$ 810	$ 571