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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 2,253 $ 41 $ 4,533
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for doubtful accounts 1,337 1,610 1,305
Depreciation and amortization 12,719 9,987 5,994
Deferred income taxes (411) (1,813) (713)
(Gain) loss on sale of fixed assets (4) 30 0
Unrealized gain (loss) on derivative instruments (57) 0 222
Compensation expense related to stock-based awards and employee stock purchase plan 3,734 3,771 4,124
Foreign Currency Transaction Gain (Loss), Unrealized 391 0 0
Changes in operating assets and liabilities:      
Accounts receivable (5,803) (8,235) 1,229
Inventories (3,755) 867 (1,967)
Prepaid expenses and other assets (1,576) 1,141 619
Other non-current assets 1,539 569 (675)
Accounts payable (3,390) 1,676 1,196
Deferred revenue (1,643) 1,622 (124)
Accrued expenses 3,023 (1,002) 891
Other long-term liabilities (74) 106 65
Net cash provided by operating activities 8,397 10,370 16,255
Cash flows from investing activities:      
Capital expenditures (5,694) (5,118) (4,720)
Proceeds from Sale of Property, Plant, and Equipment 0 0 0
Net cash paid for business acquired 0 (43,448) (22,944)
Purchases of marketable securities (11,323) (12,270) (41,950)
Maturities and sales of marketable securities 13,217 34,150 24,867
Net cash used in investing activities (3,800) (26,686) (44,747)
Cash flows from financing activities:      
Repayments of long-term debt (1,307) (1,272) (1,030)
Borrowings from long-term debt 0 0 5,844
Repayments of Long-term loan (4,876) (1,219) 0
Proceeds from Long-term loan 0 65,000 0
Proceeds from stock options exercised and employee stock purchase plan 432 608 2,344
Payment of employee restricted stock withholdings (578) (482) (828)
Repayments of line of credit borrowings 0 (30,000) 0
Proceeds from line of credit borrowings 0 0 23,000
Payment of stock registration fee 0 41 (5)
Net cash (used in) provided by financing activities (6,329) 32,676 29,325
Effect of exchange rate changes on cash and cash equivalents (838) (429) (453)
Net (decrease) increase in cash and cash equivalents (2,570) 15,931 380
Cash and cash equivalents at beginning of period 25,289 9,358 8,978
Cash and cash equivalents at end of period 22,719 25,289 9,358
Supplemental disclosure of cash flow information:      
Cash paid for interest 1,467 1,296 601
Cash paid for income taxes $ 2,182 $ 2,470 $ 1,248