Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (16,509)	$ (18,956)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation of property and equipment	9,961	7,601
Amortization of software development costs	6,289	4,876
Amortization of intangible assets	3,837	3,776
Amortization of deferred debt issuance costs	290	391
Stock-based compensation	6,870	6,510
Loss on disposal of property and equipment	1,444	148
Interest accretion	2,940	1,843
Amortization of investment premium	670	148
Deferred income taxes	(2,429)
Changes in operating assets and liabilities, net of business acquisitions:
Accounts and other receivables, net	(3,657)	(11,564)
Other current assets	(1,577)	(2,109)
Other non-current assets	(1,445)	11
Trade accounts payable	1,647	2,467
Accrued liabilities	(990)	1,021
Accrued commissions	572	787
Deferred rent and lease incentive obligation	6,988
Other long-term liabilities		(220)
Deferred revenue	3,954	4,246
Net cash provided by operating activities	18,855	976
Cash flows from investing activities:
Decrease in restricted cash	81
Sales and maturities of available for sale investments	67,089	13,716
Purchases of available for sale investments	(30,868)	(89,879)
Capitalized software development costs	(10,924)	(7,457)
Purchases of property and equipment	(16,841)	(10,162)
Business acquisitions, net of cash acquired	(18,446)
Payments made on deposits		(19)
Net cash used in investing activities	(9,909)	(93,801)
Cash flows from financing activities:
Proceeds from exercise of options	3,398	2,603
Proceeds from sale of stock under employee stock purchase plan	826	1,249
Principal payments under debt and capital lease obligations		(11,824)
Purchase of treasury stock	(1,347)	(643)
Payments under revolving credit agreement		(11,000)
Proceeds from issuance of convertible notes, net		111,190
Net cash provided by financing activities	2,877	91,575
Net (decrease) increase in cash and cash equivalents	11,823	(1,250)
Cash and cash equivalents at the beginning of the period	29,050	32,414
Cash and cash equivalents at the end of the period	40,873	31,164
Supplemental schedule of non-cash investing and financing activities:
Payments due for property and equipment included in trade accounts payable	760	472
Unrealized gains (losses) on available for sale investments, net	80	$ (34)
Issuance of common stock for acquisition of a business	$ 344