Fair Value Measurements - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
Jul. 31, 2012	Sep. 30, 2013	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] FPMI Stock [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] FPMI Stock [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] NAVB Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments shares			39,209	39,209	285,000
Debt conversion amount	$ 16,000,000	$ 16,000,000
Actual calculated fair value of the liability		$ 16,600,000

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration