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Stockholders' Equity (Additional Information) (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Sep. 23, 2013 | Sep. 18, 2013 | Dec. 18, 2012 | Apr. 13, 2012 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | May 08, 2013 | Apr. 13, 2011 | Sep. 18, 2013 Common Stock [Member] | Sep. 18, 2013 Warrants to purchase common stock [Member] | Dec. 18, 2012 Warrants to purchase common stock [Member] | Jan. 21, 2012 Kwang Dong Pharmaceutical Company [Member] | Dec. 31, 2013 Kwang Dong Pharmaceutical Company [Member] | Jan. 21, 2012 Kwang Dong Pharmaceutical Company [Member] Common Stock [Member] | Dec. 31, 2013 Kwang Dong Pharmaceutical Company [Member] Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (usd per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 200,000,000 | 125,000,000 |  |  |  |  |  |  |  |  |  |
Common stock, par value (usd per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  | $ 1.28 |  |  |  |  |  |  |
Issuance of common stock, shares |  | 17,500,000 |  | 9,751,000 |  |  |  |  |  |  |  |  |  |  |  | 579,710 | 492,988
Share Price |  | $ 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 5,200,000 | $ 35,000,000 | $ 24,300,000 | $ 14,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares Per Unit |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares availabe from warrants |  | 0.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | 2.50 |  |  |  |  |  |  | 2.47 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Overallotment Option |  |  |  |  |  |  |  |  |  |  | 2,625,000 | 918,750 |  |  |  |  |
Proceeds From Issuance or Sale of Equity, Net Underwriting Discounts, Commissions and Offering Expenses |  |  | 22,500,000 | 13,500,000 | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Warrant To Purchase Share Of Common Stock |  |  | 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Warrant Or Right Exercise Price Of Warrants |  |  | $ 1.90 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued Under Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |  | 15,156,250 |  |  |  |
Class Of Warrant Or Right Exercise Price Of Warrants Under Underwritten Public Offering |  |  | $ 1.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 37,539,000 | $ 36,378,000 | $ 18,615,000 |  |  |  |  |  | $ 400,000 | $ 1,247,000 |  |

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