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Stockholders' Equity (Details Textual) (USD $) | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Nov. 19, 2010 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Public Offering | Dec. 31, 2012 Public Offering | Dec. 31, 2012 At the Market Equity Offering Program | Dec. 31, 2013 2006 Stockholder Rights Plan right | Dec. 31, 2013 Series A Preferred Stock | Dec. 31, 2013 Stock Options | Dec. 31, 2012 Stock Options | Dec. 31, 2011 Stock Options | Dec. 31, 2013 Restricted Stock | Dec. 31, 2012 Restricted Stock | Dec. 31, 2011 Restricted Stock | Dec. 31, 2013 2002 Stock Incentive Plan Director | May 31, 2012 2002 Stock Incentive Plan Stock Options | May 29, 2009 2002 Stock Incentive Plan Stock Options | Dec. 31, 2013 2002 Stock Incentive Plan Stock Options | Dec. 31, 2013 2002 Stock Incentive Plan Stock Options Vest 1/8 on the six month anniversary of the date of grant | Dec. 31, 2013 2002 Stock Incentive Plan Stock Options Vest 1/48 each month for forty-two months | Dec. 31, 2013 Employee Stock Purchase Plan | Dec. 31, 2012 Employee Stock Purchase Plan | Dec. 31, 2011 Employee Stock Purchase Plan | Dec. 31, 2013 Employee Stock Purchase Plan Stock Options | Dec. 31, 2012 Employee Stock Purchase Plan Stock Options | Dec. 31, 2011 Employee Stock Purchase Plan Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase the number of shares under the 2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 1,300,000 |  |  |  |  |  |  |  |  |
Shares available for future option grants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  | 1 year |  |  |  | 6 months | 42 months |  |  |  |  |  |
Award vesting right percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% | 2.08% |  |  |  |  |  |
Award expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  | 6 months |  |  |  |  |
Weighted-average grant date fair value of stock options |  |  |  |  |  |  |  |  |  | $ 14.28 | $ 9.13 | $ 6.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised |  |  |  |  |  |  |  |  |  | $ 5,900,000 | $ 500,000 | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |  |  | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period in which cost is expected to be recognized |  |  |  |  |  |  |  |  |  | 2 years 3 months 15 days |  |  | 1 year 1 month 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 1,000,000 | 58,000
Weighted-average grant-date fair value of restricted stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.71 | $ 13.76 | $ 10.07 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost, restricted stock |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares allowed to purchase in employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250 |  |  |  |  |
Offering period of shares in employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Percentage lesser of fair market value taken as purchase price of share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
Common stock issued under amended ESSP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,016 | 10,763 | 7,611 |  |  |
Stock-based compensation expense |  | 5,666,000 | 4,067,000 | 3,351,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,517 | 38,000 | 13,000 |  |  |
Revenue volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36.00% | 34.00% | 18.00% |  |  |
Shares issued under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,673 |  |  |  |  |
Shares available for future purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,515 |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized |  | 5,000,000 |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder Rights Plan and Warrants [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rights per outstanding share of common stock |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquistion of company's common stock causing warrants or rights to become exercisable |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquistion of company's common stock from tender offer causing warrants or rights to become exercisable |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, acquiring person discount |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase number of shares |  |  |  |  |  |  |  | 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares, stockholder other than acquiring person, exercise price percentage |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  | 20,468,521 | 21,278,606 |  | 0 | 302,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse Stock Split [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, conversion ratio | 0.1667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Offering [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, weighted average price per share |  |  |  |  |  | $ 18.87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  | 0 | 5,313,000 | 0 |  |  | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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