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Selected Quarterly Financial Data (Unaudited) - Allocation of Depreciation and Amortization Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total depreciation and amortization $ 2,086 $ 2,140 $ 2,060 $ 2,103 $ 1,863 $ 1,840 $ 1,910 $ 1,775 $ 8,390 $ 7,388 $ 6,463
Cost of Revenue                      
Total depreciation and amortization 1,608 1,668 1,616 1,680 1,483 1,470 1,558 1,439      
Research and Development                      
Total depreciation and amortization 224 204 161 148 140 126 102 87      
Sales and Marketing                      
Total depreciation and amortization 58 56 54 53 54 52 51 49      
General and Administrative                      
Total depreciation and amortization $ 196 $ 212 $ 229 $ 222 $ 186 $ 192 $ 199 $ 200