CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (5,978)	$ 4,674
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	7,993	7,985
Gain on sale or disposal of Property, equipment and leasehold improvements	(8)	(549)
Deferred income taxes	(2,764)	(673)
Stock-based compensation	1,589	1,058
Lease expense	171
Other	(189)	206
Changes in operating assets and liabilities:
Accounts receivable, net	11,975	(676)
Inventories	(3,851)	(2,905)
Other current assets	(1,120)	2,360
Accounts payable and other accrued expenses	8,986	4,922
Deferred revenue	17,537	1,950
Accrued salaries, wages and payroll taxes	247	(1,128)
Refundable deposits	(114)	(560)
Net cash provided by operating activities	34,474	16,664
Cash flows from investing activities:
Expenditures for Property, equipment and leasehold improvements	(10,478)	(6,216)
Proceeds from sale of Property, equipment and leasehold improvements	55	22,998
Restricted cash from sale of Property, equipment and leasehold improvements	0	515
Business combinations and asset acquisitions	(274)	0
Net cash provided by (used in) investing activities	(10,697)	17,297
Cash flows from financing activities:
Proceeds from issuance of long-term debt	5,192	0
Principal payments on debt and finance lease obligations	(798)	(520)
Net repayments under revolving line of credit	(17,264)	(22,199)
Proceeds from issuances of common stock	0	427
Tax payments related to stock-based awards	(325)	(92)
Net cash used in financing activities	(13,195)	(22,384)
Increase in Cash, cash equivalents and restricted cash	10,582	11,577
Cash, cash equivalents and restricted cash:
Beginning of period	1,200	579
End of period	11,782	12,156
Supplemental disclosure of cash flow information:
Cash paid for interest	1,414	396
Cash paid for income taxes, net	559	450
Cash paid for amounts included in measurement of lease liabilities	2,369
Supplemental disclosure of non-cash information:
Right-of-use assets obtained in exchange for operating lease obligations	24,898
Right-of-use assets obtained in exchange for finance lease obligations	2,538
Purchases of Property, equipment and leasehold improvements included in Accounts payable at end of period	$ 937	$ 205