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Stock-Based Awards - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Stock_Plan	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock option plans	6
Issuance of common stock pursuant to stock options	25,000,000
Stock option issuance period	10 years
Option issued period	Options are issued generally for terms of ten years
Expire dates on options	March 16, 2014, to November 15, 2021
Period of employees were required to remain in the company	4 years
Stock options strike price	$ 1.07
Percentage of weighted-average price	50.00%
Options prices range, lower limit	$ 1.75
Options prices range, upper limit	$ 9.45
Weighted-average exercise price	$ 4.34
Excess fair value of option		$ 589
Alternative strike price program expense		$ 118	$ 138
Excess fair value of option period	4 years
Number of options awards granted			825,000
Weighted average exercise price	$ 0.00	$ 0.00	$ 5.80
Option awards outstanding to non-employees	7,844,691	12,760,191	20,852,614	21,443,617
Options, exercised	4,875,500	8,018,516	1,280,687
Estimated weighted-average fair value for options			$ 3.31
Nonemployee Consultants and Special Advisors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options awards granted		1,320,833	1,320,833
Weighted average exercise price		$ 1.34	$ 1.34
Option awards outstanding to non-employees		0
Non Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options awards granted		0
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, exercised			77,500
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of unvested restricted stock awards granted to nonemployee consultants and special advisers	0		312,500
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	2 years
Minimum [Member] | Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	4 years
Maximum [Member] | Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vested period	4 years

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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