Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (1,367) $ 3,815 $ 9,932
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 4,650 3,779 2,667
Stock-based compensation expense 2,561 1,999 920
Loss on disposal of property and equipment 0 35 11
Deferred income taxes (243) 1,557 (6,083)
Loss in equity interest 561 0 0
Change in assets and liabilities:      
Accounts receivable, net 1,055 (1,288) (4,682)
Prepaid expenses and other current assets 189 253 (45)
Other long-term assets 220 380 164
Accounts payable (527) 2,335 4,120
Accrued expenses and other current liabilities (2,205) 1,715 1,709
Other long-term liabilities 334 77 (35)
Net cash provided by operating activities 5,228 14,657 8,678
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of property and equipment (5,920) (4,269) (1,848)
Investment of equity interest (926) 0 0
Cash paid for business acquisition (1,011) (600) 0
Purchase of convertible promissory note (1,000) 0 0
Net cash used in investing activities (8,857) (4,869) (1,848)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from sale/leaseback 0 0 794
Repayment on bank financing 0 (250) (500)
Repayments on capital lease obligations (2,121) (2,336) (1,719)
Proceeds from exercise of common stock options 195 1,212 372
Proceeds from initial public offering 0 25,364 0
Initial public offering costs 0 (2,753) (264)
Net cash (used in) provided by financing activities (1,926) 21,237 (1,317)
Effect of exchange rate changes on cash and cash equivalents 8 (6) 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (5,547) 31,019 5,513
CASH AND CASH EQUIVALENTS—Beginning of year 41,944 10,925 5,412
CASH AND CASH EQUIVALENTS—End of year 36,397 41,944 10,925
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:      
Cash paid for interest 165 259 110
Cash paid for income taxes 140 134 82
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING TRANSACTIONS:      
Property and equipment acquired under capital lease obligations and bank financing 1,039 2,484 2,185
Accrual for business acquisition 495 500 0
Accrued property and equipment expenditures 719 269 235
Accrued initial public offering costs $ 0 $ 0 $ 1,042