CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income (loss)	$ (3,483)us-gaap_NetIncomeLoss	$ 10,383us-gaap_NetIncomeLoss	$ (5,424)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation expense	2,874us-gaap_ShareBasedCompensation	3,481us-gaap_ShareBasedCompensation	4,525us-gaap_ShareBasedCompensation
Amortization of intangible assets and other	1,091us-gaap_AmortizationOfIntangibleAssets	1,321us-gaap_AmortizationOfIntangibleAssets	1,522us-gaap_AmortizationOfIntangibleAssets
Warrant-related charges	0sprt_WarrantIssuanceCosts	777sprt_WarrantIssuanceCosts	0sprt_WarrantIssuanceCosts
Amortization of premiums and discounts on investments	726	646	588
Depreciation	275us-gaap_Depreciation	351us-gaap_Depreciation	503us-gaap_Depreciation
Amortization of purchased technology	0us-gaap_CostOfServicesAmortization	62us-gaap_CostOfServicesAmortization	81us-gaap_CostOfServicesAmortization
Changes in assets and liabilities:
Accounts receivable, net	(634)	(4,304)	747
Prepaid expenses and other current assets	(82)	32	(342)
Other assets	(80)	76	(460)
Accounts payable	764	414	(752)
Accrued compensation	634	539	(67)
Other accrued liabilities	(331)	(623)	(527)
Other long-term liabilities	336	316	201
Deferred revenue	(632)	(3,295)	1,357
Net cash provided by operating activities	1,458	10,176	1,952
Investing activities:
Purchases of property and equipment	(231)	(221)	(523)
Acquisition of business, net of cash acquired	0	0	(1,327)
Purchases of investments	(63,510)us-gaap_PaymentsToAcquireInvestments	(61,779)us-gaap_PaymentsToAcquireInvestments	(37,764)us-gaap_PaymentsToAcquireInvestments
Sales of investments	0	104	2,400
Maturities of investments	56,275	42,544	40,445
Net cash (used in) provided by investing activities	(7,466)	(19,352)	3,231
Financing activities:
Utilized excess tax benefit	(8)	34	0
Proceeds from issuance of common stock	1,096	11,045	3,530
Repurchase of common stock	0	(4,114)	0
Net cash provided by financing activities	1,088	6,965	3,530
Net (decrease) increase in cash and cash equivalents	(4,920)	(2,211)	8,713
Effect of exchange rate changes on cash and cash equivalents	(116)	(251)	(20)
Cash and cash equivalents at beginning of year	28,390	30,852	22,159
Cash and cash equivalents at end of year	23,354	28,390	30,852
Supplemental schedule of cash flow information:
Cash paid for income taxes	$ 225us-gaap_IncomeTaxesPaid	$ 120us-gaap_IncomeTaxesPaid	$ 86us-gaap_IncomeTaxesPaid

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- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
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