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Stock-Based Compensation (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Jun. 28, 2013
Stock-based compensation in the form of employee stock options and restricted stock [Abstract] |  |  |  |  |  |
Total stock-based compensation | $ 334,000 | $ 300,000 | $ 1,004,000 | $ 873,000 |  |
Tax effect on stock-based compensation | 0 | 0 | 0 | 0 |  |
Net effect on net income (loss) | 334,000 | 300,000 | 1,004,000 | 873,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grant date fair value of stock options granted (in dollars per share) | $ 1.21 | $ 0 |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation costs related to unvested stock options not yet recognized | 1,500,000 |  | 1,500,000 |  |  |
Value of estimated forfeitures |  |  | 30,000 |  |  |
Weighted-average period of amortization |  |  | 2 years 4 months 24 days |  |  |
Weighted-average grant date fair value of stock options granted (in dollars per share) |  |  | $ 1.21 | $ 2.84 |  |
Weighted average assumptions [Abstract] |  |  |  |  |  |
Expected term (in years) | 4 years |  | 4 years |  |  |
Volatility (in hundredths) | 61.86% |  | 61.86% |  |  |
Expected dividend (in hundredths) | 0.00% |  | 0.00% |  |  |
Risk-free interest rate (in hundredths) | 1.00% |  | 1.00% |  |  |
Number of options outstanding [Roll Forward] |  |  |  |  |  |
Options outstanding, beginning of period (in shares) |  |  | 2,727,000 |  |  |
Granted (in shares) |  | 0 | 60,000 |  |  |
Exercised (in shares) |  |  | (200,000) |  |  |
Canceled and expired (in shares) |  |  | (48,000) |  |  |
Options outstanding, end of period (in shares) | 2,539,000 |  | 2,539,000 |  | 2,727,000 |
Options vested and expected to vest as of September 30, 2013 | 2,522,000 |  | 2,522,000 |  |  |
Options exercisable as of September 30, 2013 | 1,682,000 |  | 1,682,000 |  |  |
Weighted average exercise price [Roll Forward] |  |  |  |  |  |
Options outstanding, beginning of period (in dollars per share) |  |  | $ 3.28 |  |  |
Granted (in dollars per share) |  | $ 0 | $ 2.55 |  |  |
Exercised (in dollars per share) |  |  | $ 1.40 |  |  |
Canceled and expired (in dollars per share) |  |  | $ 4.42 |  |  |
Options outstanding, end of period (in dollars per share) | $ 3.39 |  | $ 3.39 |  | $ 3.28 |
Options vested and expected to vest as of September 30, 2013 | $ 3.39 |  | $ 3.39 |  |  |
Options exercisable as of September 30, 2013 | $ 3.22 |  | $ 3.22 |  |  |
Weighted average Remaining Contractual Life [Abstract] |  |  |  |  |  |
Options outstanding, beginning of period |  |  | 6 years 5 months 8 days |  | 6 years 8 months 16 days |
Options outstanding, end of period |  |  | 6 years 5 months 8 days |  | 6 years 8 months 16 days |
Options vested and expected to vest, end of period |  |  | 6 years 5 months 1 day |  |  |
Option exercisable, end of period |  |  | 5 years 3 months 18 days |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |  |  |
Options outstanding, beginning of period |  |  | 1,353,000 |  |  |
Options outstanding, end of period | 610,000 |  | 610,000 |  | 1,353,000 |
Options vested and expected to vest, aggregate intrinsic value | 610,000 |  | 610,000 |  |  |
Options exercisable, end of period | 607,000 |  | 607,000 |  |  |
Closing price (in dollars per share) |  |  |  |  |  | $ 2.34
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average period of amortization |  |  | 2 years 4 months 24 days |  |  |
Shares [Roll Forward] |  |  |  |  |  |
Non-vested, beginning of period (in shares) |  |  | 238,723 |  |  |
Granted (in shares) |  |  | 43,636 |  |  |
Vested (in shares) |  |  | (47,767) |  |  |
Non-vested, end of period (in shares) | 234,592 |  | 234,592 |  |  |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |  |  |
Non-vested, beginning of period (in dollars per share) |  |  | $ 4.27 |  |  |
Granted (in dollars per share) |  |  | $ 2.75 |  |  |
Vested (in dollars per share) |  |  | $ 5.13 |  |  |
Non-vested, end of period (in dollars per share) | $ 3.82 |  | $ 3.82 |  |  |
Unrecognized compensation expense related to restricted stock awards | 687,000 |  | 687,000 |  |  |
Cost of revenue [Member] |  |  |  |  |  |
Stock-based compensation in the form of employee stock options and restricted stock [Abstract] |  |  |  |  |  |
Total stock-based compensation | 6,000 | 19,000 | 17,000 | 56,000 |  |
Selling, general and administrative [Member] |  |  |  |  |  |
Stock-based compensation in the form of employee stock options and restricted stock [Abstract] |  |  |  |  |  |
Total stock-based compensation | 285,000 | 245,000 | 860,000 | 721,000 |  |
Research and development [Member] |  |  |  |  |  |
Stock-based compensation in the form of employee stock options and restricted stock [Abstract] |  |  |  |  |  |
Total stock-based compensation | $ 43,000 | $ 36,000 | $ 127,000 | $ 96,000 |  |

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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 The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 options outstanding, including both vested and non-vested options. + 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 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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