Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (13,278)	$ 1,704
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation of property and equipment	4,877	3,399
Amortization of software development costs	3,192	2,823
Amortization of intangible assets	2,599	1,044
Accretion of discount and issuance costs on notes	1,217	16
Stock-based compensation	4,210	2,953
Loss on disposal of property and equipment	72	544
Deferred income taxes		(9,368)
Changes in operating assets and liabilities, net of business acquisitions:
Accounts and other receivables, net	(2,311)	(4,167)
Other current assets	(1,400)	(141)
Other non-current assets	192	(73)
Trade accounts payable	1,144	2,110
Accrued liabilities	1,253	187
Accrued commissions	441	252
Deferred rent	(185)	(66)
Deferred revenue	3,166	1,636
Net cash provided by operating activities	5,189	2,853
Cash flows from investing activities:
Purchases of investments	(64,122)
Proceeds from maturities and sales of investments	986
Capitalized software development costs	(4,418)	(5,004)
Purchases of property and equipment	(8,196)	(5,162)
Acquisition of assets		(10,164)
Payments made for deposits	(19)	(31)
Net cash used in investing activities	(75,769)	(20,361)
Cash flows from financing activities:
Proceeds from exercise of options	2,294	1,375
Proceeds from sale of stock under employee stock purchase plan	806	345
Borrowings under term loan		1,000
Principal payments under debt and capital lease obligations	(11,824)	(2,227)
Purchase of treasury stock	(538)	(36)
Payments under the revolving credit agreement	(11,000)
Proceeds from issuance of convertible notes, net	111,190
Net cash provided by financing activities	90,928	457
Net increase (decrease) in cash and cash equivalents	20,348	(17,051)
Cash and cash equivalents at the beginning of the period	32,414	49,148
Cash and cash equivalents at the end of the period	52,762	32,097
Supplemental schedule of non-cash investing and financing activities:
Payments due for property and equipment included in trade accounts payable	149	2,340
Property and equipment financed through capital leases		1,702
Issuance of common stock for acquisition of a business		31,951
Unrealized losses on investments	20
Investments payable in accrued liabilities	$ 1,536
Consideration for acquisition of business included in accrued liabilities likely to be paid in cash based on the final calculation of net closing current assets		$ 3,080