Warrant Exercise (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Class of Warrant or Right [Line Items]
Cash Received		$ 101
Equity Warrants
Class of Warrant or Right [Line Items]
Warrant exercised	43,300	49,315
Common Stock Issued
Class of Warrant or Right [Line Items]
Warrant exercised	21,977	49,315
Cash exercises
Class of Warrant or Right [Line Items]
Cash Received		$ 101
Cash exercises | Equity Warrants
Class of Warrant or Right [Line Items]
Warrant exercised		49,315
Cash exercises | Common Stock Issued
Class of Warrant or Right [Line Items]
Warrant exercised		49,315
Cashless Exercise | Equity Warrants
Class of Warrant or Right [Line Items]
Warrant exercised	43,300
Cashless Exercise | Common Stock Issued
Class of Warrant or Right [Line Items]
Warrant exercised	21,977