Warrants (Narrative) (Details)	6 Months Ended
Jun. 30, 2013
Series A
Exercise price, in dollars	6.00
Warrant exercise term	5 years
Description of warrants	The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009. Series A Warrants: The Series A warrants have an exercise price of $6.00 and a term of 5 years from the issue date subject to the Exchange Cap (as defined in the agreement). Anti-dilution Adjustments for Certain Warrants: Since the private placement in November 2010 involved sales of the Company's stock at a price that activated anti-dilution provisions in the Series A, C, F and certain placement agent warrants, the exercise price of these warrants is adjusted to $3.74 per share and the number of warrants eligible is multiplied by a factor of 6 / 3.74 or 1.60 with fractional shares rounding up.
Series B
Exercise price, in dollars	0.01
Warrant exercise term	3 months
Description of warrants	The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009. Series B Warrants: The Series B warrants have an exercise price of $0.01 and a term of three (3) months from the issue date provided, however, that such date shall be extended indefinitely if the warrant cannot be exercised due to the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap Limitation (as defined in the agreement) until the warrant can be exercised in full by the holder thereof without breaching the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap Limitation (as defined in the agreement). All B Warrants were exercised in December 2009.
Series C
Exercise price, in dollars	6.00
Warrant exercise term	5 years
Description of warrants	The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009. Series C Warrants: The Series C warrants shall be exercisable only upon the exercise of the Series B warrants. The Series C warrants shall have an exercise price of $6.00 and a term of 5 years from the issue date. Anti-dilution Adjustments for Certain Warrants: Since the private placement in November 2010 involved sales of the Company's stock at a price that activated anti-dilution provisions in the Series A, C, F and certain placement agent warrants, the exercise price of these warrants is adjusted to $3.74 per share and the number of warrants eligible is multiplied by a factor of 6 / 3.74 or 1.60 with fractional shares rounding up.
Series D
Exercise price, in dollars	0.01
Warrant exercise term	3 months
Description of warrants	The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009. Series D Warrants: The Series D warrants shall be exercisable if the Company fails to meet certain performance criteria for the year 2009. The Series D warrant shall have an exercise price of $0.01 and a term of exercise equal to three (3) months from the date the Maximum Eligibility Date (as defined in the agreement); provided, however, that such date shall be extended indefinitely if the warrant cannot be exercised due to the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap (as defined in the agreement) until the warrant can be exercised in full by the holder without breaching the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap Limitation (as defined in the agreement). Due to the Net Income of Zoom as reported in the Company's annual report for the year 2009 exceeding the eligibility threshold pursuant to the agreement, the Series D Warrants became ineligible for exercise.
Series E
Exercise price, in dollars	0.01
Warrant exercise term	3 months
Description of warrants	The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009. Series E Warrants: The Series E warrants shall be exercisable if the Company fails to meet certain performance criteria for the year 2010. The Series E warrants shall have an exercise price of $0.01 and a term of three (3) months from the date the Maximum Eligibility Date (as defined in the agreement); provided, however, that such date shall be extended indefinitely if the warrant cannot be exercised due to the Beneficial Ownership Limitation (as defined in the agreement) until the Warrant can be exercised in full by the holder thereof without breaching the Beneficial Ownership Limitation (as defined in the agreement). Due to the Net Income of Zoom as reported in the Company's annual report for the year 2010 exceeding the eligibility threshold pursuant to the agreement, the Series E Warrants became ineligible for exercise.
Series F
Exercise price, in dollars	6.00
Warrant exercise term	5 years
Description of warrants	The Company granted on May 6, 2010, Series F warrants to the above investors for their temporary forfeiture of their right to participate in the Company's future financings. Series F Warrants: The Series F warrants have an exercise price of $6.00 and a term of 5 years from the issue date. The Company issued 375,000 Series F warrants to investors who participated in private placement transaction pursuant to the Securities Purchase Agreement dated October 15, 2009, to temporarily waive their right for a period of eight months to participate in a future offering of the Company. The investors originally have a period of twenty-four months ("Rights Period") in which they have the right to participate, and for providing a temporary waiver, an eight-month duration is added to the original expiration of the Rights Period. Anti-dilution Adjustments for Certain Warrants: Since the private placement in November 2010 involved sales of the Company's stock at a price that activated anti-dilution provisions in the Series A, C, F and certain placement agent warrants, the exercise price of these warrants is adjusted to $3.74 per share and the number of warrants eligible is multiplied by a factor of 6 / 3.74 or 1.60 with fractional shares rounding up.
Series G
Exercise price, in dollars	4.71
Warrant exercise term	5 years
Description of warrants	The Company granted Series G warrants to the accredited investors as part of its private place offering on November 15, 2010. Series G Warrants: The Series G warrants shall have an exercise price of $4.71 and a term of 5 years from the issue date.

6.00

The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009.

Series A Warrants: The Series A warrants have an exercise price of $6.00 and a term of 5 years from the issue date subject to the Exchange Cap (as defined in the agreement).

Anti-dilution Adjustments for Certain Warrants: Since the private placement in November 2010 involved sales of the Company's stock at a price that activated anti-dilution provisions in the Series A, C, F and certain placement agent warrants, the exercise price of these warrants is adjusted to $3.74 per share and the number of warrants eligible is multiplied by a factor of 6 / 3.74 or 1.60 with fractional shares rounding up.

Exercise price, in dollars

0.01

Description of warrants

The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009.

Series B Warrants: The Series B warrants have an exercise price of $0.01 and a term of three (3) months from the issue date provided, however, that such date shall be extended indefinitely if the warrant cannot be exercised due to the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap Limitation (as defined in the agreement) until the warrant can be exercised in full by the holder thereof without breaching the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap Limitation (as defined in the agreement). All B Warrants were exercised in December 2009.

Exercise price, in dollars

6.00

Description of warrants

The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009.

Series C Warrants: The Series C warrants shall be exercisable only upon the exercise of the Series B warrants. The Series C warrants shall have an exercise price of $6.00 and a term of 5 years from the issue date.

Anti-dilution Adjustments for Certain Warrants: Since the private placement in November 2010 involved sales of the Company's stock at a price that activated anti-dilution provisions in the Series A, C, F and certain placement agent warrants, the exercise price of these warrants is adjusted to $3.74 per share and the number of warrants eligible is multiplied by a factor of 6 / 3.74 or 1.60 with fractional shares rounding up.

Exercise price, in dollars

0.01

Description of warrants

The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009.

Series D Warrants: The Series D warrants shall be exercisable if the Company fails to meet certain performance criteria for the year 2009. The Series D warrant shall have an exercise price of $0.01 and a term of exercise equal to three (3) months from the date the Maximum Eligibility Date (as defined in the agreement); provided, however, that such date shall be extended indefinitely if the warrant cannot be exercised due to the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap (as defined in the agreement) until the warrant can be exercised in full by the holder without breaching the Beneficial Ownership Limitation (as defined in the agreement) or the Exchange Cap Limitation (as defined in the agreement). Due to the Net Income of Zoom as reported in the Company's annual report for the year 2009 exceeding the eligibility threshold pursuant to the agreement, the Series D Warrants became ineligible for exercise.

Exercise price, in dollars

0.01

Description of warrants

The Company granted Series A, B, C, D and E warrants to the accredited investors as part of its private placement offering on October 16, 2009 and November 18, 2009.

Series E Warrants: The Series E warrants shall be exercisable if the Company fails to meet certain performance criteria for the year 2010. The Series E warrants shall have an exercise price of $0.01 and a term of three (3) months from the date the Maximum Eligibility Date (as defined in the agreement); provided, however, that such date shall be extended indefinitely if the warrant cannot be exercised due to the Beneficial Ownership Limitation (as defined in the agreement) until the Warrant can be exercised in full by the holder thereof without breaching the Beneficial Ownership Limitation (as defined in the agreement). Due to the Net Income of Zoom as reported in the Company's annual report for the year 2010 exceeding the eligibility threshold pursuant to the agreement, the Series E Warrants became ineligible for exercise.

Exercise price, in dollars

6.00

Description of warrants

The Company granted on May 6, 2010, Series F warrants to the above investors for their temporary forfeiture of their right to participate in the Company's future financings.

Series F Warrants: The Series F warrants have an exercise price of $6.00 and a term of 5 years from the issue date. The Company issued 375,000 Series F warrants to investors who participated in private placement transaction pursuant to the Securities Purchase Agreement dated October 15, 2009, to temporarily waive their right for a period of eight months to participate in a future offering of the Company. The investors originally have a period of twenty-four months ("Rights Period") in which they have the right to participate, and for providing a temporary waiver, an eight-month duration is added to the original expiration of the Rights Period.

Anti-dilution Adjustments for Certain Warrants: Since the private placement in November 2010 involved sales of the Company's stock at a price that activated anti-dilution provisions in the Series A, C, F and certain placement agent warrants, the exercise price of these warrants is adjusted to $3.74 per share and the number of warrants eligible is multiplied by a factor of 6 / 3.74 or 1.60 with fractional shares rounding up.

Exercise price, in dollars

4.71

Description of warrants

The Company granted Series G warrants to the accredited investors as part of its private place offering on November 15, 2010.

Series G Warrants: The Series G warrants shall have an exercise price of $4.71 and a term of 5 years from the issue date.