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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 15,030,253 $ 3,068,002
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,198,799 1,202,208
Stock-based compensation expense 427,823 422,959
Deferred income taxes (323,669) (139,747)
Provision for inventory 31,778 258,195
Tax benefit from exercise of stock options (4,436,249) (64,642)
Changes in operating assets and liabilities:    
Accounts receivable 2,140,848 6,373,839
Inventories (2,016,631) (1,969,179)
Prepaid expenses, other current and long-term assets (345,415) 705,078
Long-term deposits and other   8,499
Accounts payable 51,712 1,354,318
Accrued expenses (1,104,945) (2,351,133)
Deferred revenue (2,113,086) (725,067)
Income taxes payable 5,099,027 (1,834,739)
Other long-term liabilities (43,588) (239,737)
Net cash provided by operating activities 13,596,657 6,068,854
Cash flows from investing activities:    
Proceeds from sale of assets   135,607
Purchase of property and equipment (276,513) (35,802)
Net cash provided by (used in) investing activities (276,513) 99,805
Cash flows from financing activities:    
Principal payments on debt   (400,000)
Proceeds from exercise of stock options 1,067,767 1,097,016
Tax benefit from exercise of stock options 4,436,249 64,642
Net cash provided by financing activities 5,504,016 761,658
Exchange rate impact on cash 2,931 (32,228)
Increase in cash and cash equivalents 18,827,091 6,898,089
Cash and cash equivalents at beginning of period 63,333,160 44,067,477
Cash and cash equivalents at end of period $ 82,160,251 $ 50,965,566