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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income from continuing operations $ 5,520 $ 38,710
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:    
Depreciation and amortization 7,927 4,359
Loss on asset disposal 14 0
Deferred tax expense (benefit) (1,816) 1,724
Stock-based compensation 4,066 2,726
Changes in assets and liabilities:    
Accounts receivable, net 2,545 (9,021)
Inventories 2,179 11,972
Foreign sales tax receivable 235 143
Other current assets 373 56
Accounts payable (2,132) (6,240)
Income taxes payable (651) 1,086
Accrued expenses (882) 673
Deferred compensation (488) 265
Deferred revenue 8,021 1,382
Other long-term liabilities (10) 0
Net cash provided by operating activities of continuing operations 24,901 47,835
Cash flows from investing activities of continuing operations:    
Purchase of short term investments (159,771) (74,807)
Maturities of short term investments 94,653 99,768
Additions to property and equipment (2,004) (914)
Additions to intangible assets (85) (75)
Other assets (4,095) (3)
Net cash provided by (used in) investing activities of continuing operations (71,302) 23,969
Cash flows from financing activities of continuing operations:    
Tax payments for restricted stock issuances (1,000) (837)
Tax benefit of stock-based compensation 0 430
Net cash provided by (used in) financing activities of continuing operations (1,000) (407)
Cash flows used in discontinued operations:    
Net cash used in operating activities of discontinued operations (15) (69)
Net cash used in discontinued operations (15) (69)
Effect of exchange rate changes on cash 351 233
Net increase (decrease) in cash (47,065) 71,561
Cash and equivalents, beginning of year 78,522 72,441
Cash and equivalents, end of period $ 31,457 $ 144,002