CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash provided by (used in) operating activities
Net income (loss)	$ 8,248	$ (54,726)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Amortization of intangible assets	3,638	5,008
Depreciation	5,161	5,196
Change in value and exercise of warrants	1,352	10,400
Stock-based compensation expense	1,248	2,663
Amortization of financing fees	698	1,497
Deferred income taxes	457	(56)
Asset impairment charges	1	2,234
Other non-cash adjustments, net	276	2,085
Changes in operating assets and liabilities:
Accounts receivable, net	(18,095)	(17,890)
Inventory, net	(3,977)	(26,202)
Prepaid expenses and other assets	17,125	(761)
Accounts payable	(9,494)	33,968
Accrued expenses	13,948	11,630
Other noncurrent liabilities	(2,429)	18,786
Net cash provided by (used in) operating activities	18,157	(6,168)
Cash used in investing activities
Capital expenditures	(3,681)	(3,645)
Asset acquisitions	0	(6,595)
Other investing activities, net	23	1
Net cash used in investing activities	(3,658)	(10,239)
Cash (used in) provided by financing activities
Proceeds from revolving line of credit	544,146	516,440
Repayments of revolving line of credit	(559,232)	(498,881)
Proceeds from Weichai Warrant exercise	1,616	0
Other financing activities, net	(1,080)	(1,098)
Net cash (used in) provided by financing activities	(14,550)	16,461
Net (decrease) increase in cash and restricted cash	(51)	54
Cash and restricted cash at beginning of the year	54	0
Cash and restricted cash at end of the year	$ 3	$ 54