CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Cumulative participating convertible preferred stock, dividend rate percentage	7.00%	7.00%
Preferred stock, par value	$ 0.001cps_PreferredStockParValuePerShare	$ 0.001cps_PreferredStockParValuePerShare
Preferred stock, shares authorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0cps_PreferredStockShareIssued	0cps_PreferredStockShareIssued
Preferred stock, shares outstanding	0cps_PreferredStockShareOutstanding	0cps_PreferredStockShareOutstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	190,000,000us-gaap_CommonStockSharesAuthorized	190,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	18,727,915us-gaap_CommonStockSharesIssued	18,685,634us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	17,081,609us-gaap_CommonStockSharesOutstanding	17,039,328us-gaap_CommonStockSharesOutstanding

Preferred Stock Dividends Rate Percentage

No definition available.

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- Definition

Face amount or stated value of participating redeemable convertible preferred stock per share; generally not indicative of the fair market value per share.

+ References

No definition available.

+ Details

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- Definition

Total number of cumulative participating redeemable convertible preferred shares issued to shareholders.

+ References

No definition available.

+ Details

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- Definition

Total number of cumulative participating redeemable convertible preferred shares outstanding to shareholders.

+ References

No definition available.

+ Details

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- Definition

Face amount or stated value per share of common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

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