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Consolidated statements of cash flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 15,525 $ 33,475 $ 5,313
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,861 14,521 13,152
Stock-based compensation expense 16,821 13,474 7,149
Amortization of debt issuance costs and discount on debt 792 810 1,281
Deferred income taxes (939) (13,434) (7,575)
Debt prepayment penalty 0 0 2,736
Loss/(gain) on foreign currency forward contracts 0 0 (10,702)
Other, net 476 1,728 247
Changes in operating assets and liabilities:      
Accounts receivable 7,649 (8,001) (15,392)
Inventories 16,338 6,718 (37,994)
Prepaid expenses and other assets (8,484) (11,200) (635)
Accounts payable and accrued expenses (10,251) (25,483) 43,144
Other liabilities (206) (230) 1,396
Net cash provided by operating activities 55,582 12,378 2,120
Cash flows from investing activities:      
Purchase of property and equipment (8,872) (7,544) (9,223)
Investment in equity securities 0 (2,875) 0
Other, net 0 0 84
Net cash used in investing activities (8,872) (10,419) (9,139)
Cash flows from financing activities:      
Proceeds from revolving line of credit 2,000 25,900 5,500
Repayment of revolving line of credit (2,000) (25,900) (13,200)
Proceeds from long-term debt 0 0 172,749
Repayment of long-term debt (8,250) (8,250) (151,540)
Debt issuance costs paid 0 (519) (704)
Cash received from issuance of common stock 3,176 1,978 64,071
Proceeds from repayment of employee note receivable 0 0 7,912
Deferred offering costs paid 0 0 (7,821)
Dividend paid 0 0 (68,000)
Other, net (490) (404) (657)
Net cash provided by (used in) financing activities (5,564) (7,195) 8,310
Net increase (decrease) in cash and cash equivalents 41,146 (5,236) 1,291
Cash and cash equivalents - beginning of period 10,059 15,295 14,004
Cash and cash equivalents - end of period 51,205 10,059 15,295
Supplemental disclosure of cash flow information:      
Cash paid for interest 7,124 8,162 12,170
Cash paid for income taxes, net of refunds 4,085 5,673 8,466
Supplemental disclosure of noncash investing and financing activities:      
Accretion of preferred stock to maximum redemption value 0 0 436,317
Deferred offering costs included in accounts payable and accrued expenses 0 0 193
Property and equipment acquired under capital leases 2,098 10 3,000
Property and equipment purchases included in accounts payable and accrued expenses 1,838 1,143 491
Vesting of shares related to early exercise of common stock options 0 4,074 7,859
Note receivable issued to finance early exercise of common stock 0 0 (11,971)
Net repayment of note receivable with dividend proceeds $ 0 $ 0 $ 4,060