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Condensed consolidated statements of cash flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 690 $ 2,160
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 4,288 3,659
Stock-based compensation expense 3,640 2,404
Amortization of debt issuance costs and discount on debt 199 202
Deferred income taxes 735 (35)
Other, net 142 330
Changes in operating assets and liabilities:    
Accounts receivable 12,771 8,480
Inventories 951 (7,496)
Prepaid expenses and other assets (1,498) (304)
Accounts payable and accrued expenses (16,891) (31,449)
Other liabilities 3 6
Net cash provided by (used in) operating activities 5,030 (22,043)
Cash flows from investing activities:    
Purchase of property and equipment (2,667) (676)
Net cash used in investing activities (2,667) (676)
Cash flows from financing activities:    
Proceeds from revolving line of credit 2,000 15,000
Repayment of revolving line of credit (2,000) 0
Repayment of long term debt (2,063) (2,063)
Cash received from issuance of common stock 212 146
Deferred offering costs paid 0 (193)
Other, net (97) (90)
Net cash provided by (used in) financing activities (1,948) 12,800
Net increase (decrease) in cash 415 (9,919)
Cash - beginning of period 10,059 15,295
Cash - end of period $ 10,474 $ 5,376