Condensed Consolidated Statements of Cash Flows (Unaudited)	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Cash flows from operating activities
Net loss	$ (8,802,000)	$ (2,568,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,605,000	2,621,000
Revaluation of warrant liabilities		149,000
Stock-based compensation expense	7,095,000	2,746,000
Changes in operating assets and liabilities:
Accounts receivable, net	(3,123,000)	(1,539,000)
Prepaid expenses and other assets	(3,032,000)	(2,153,000)
Accounts payable	919,000	999,000
Accrued liabilities and other long term liabilities	2,494,000	414,000
Accrued compensation	(701,000)	503,000
Deferred revenue	927,000	(614,000)
Net cash used in operating activities	(618,000)	558,000
Cash flows from investing activities
Purchases of property and equipment	(4,380,000)	(4,003,000)
Net cash used in investing activities	(4,380,000)	(4,003,000)
Cash flows from financing activities
Proceeds from bank borrowings		6,600,000
Principal payments on bank borrowings		(3,373,000)
Proceeds from issuance of common stock upon exercise of stock options	6,625,000	$ 1,241,000
Tax payments related to stock-based award activities	(1,049,000)
Principal payments on capital lease obligations	(860,000)	$ (660,000)
Equity offering costs	(143,000)	(1,242,000)
Repurchase of common stock		(473,000)
Net cash provided by financing activities	4,573,000	2,093,000
Net decrease in cash and cash equivalents	(425,000)	(1,352,000)
Cash and cash equivalents—beginning of period	73,520,000	8,134,000
Cash and cash equivalents—end of period	73,095,000	6,782,000
Supplemental disclosures of cash flow information:
Cash paid for interest	92,000	454,000
Cash paid for income taxes	1,204,000	704,000
Supplemental disclosures of non-cash investing and financing information:
Property and equipment financed through capital lease		1,804,000
Property and equipment purchased but not paid at period-end	$ 1,277,000	106,000
Unpaid equity offering costs		$ 2,544,000