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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 4,638 $ 5,595
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 701 716
Deferred income tax 76 193
Stock-based compensation 395 307
Provision for losses on accounts receivable (52) 95
Net foreign currency effect (9) 94
Changes in operating assets and liabilities:    
Accounts receivable (1,288) (2,036)
Deposits 133 (155)
Income tax receivable 1,266 1,564
Prepaid expenses and other current assets 447 350
Accounts payable (2,984) (549)
Reserve for unexchanged promotional shares (1,226) 0
Accrued expenses (1,294) 850
Deferred revenue 110 (517)
Deferred rent 5 (110)
Income tax payable 722 0
Other non-current liabilities 111 103
Net cash provided by operating activities 1,751 6,500
Cash flows from investing activities:    
Purchases of property and equipment (1,019) (900)
Release of restricted cash 200 0
Net cash used in investing activities (819) (900)
Cash flows from financing activities:    
Repurchase of common stock (5,569) 0
Reverse/forward stock split, including transaction costs (479) 0
Net cash used in financing activities (6,048) 0
Effect of exchange rate changes on cash and cash equivalents (72) (1,662)
Net increase (decrease) in cash and cash equivalents (5,188) 3,938
Cash and cash equivalents at beginning of period 66,223 61,169
Cash and cash equivalents at end of period 61,035 65,107
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 335 10
Leasehold improvements funded by landlord or accrued $ 1,381 $ 0