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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]
Revenues	$ 14,952us-gaap_Revenues	$ 12,417us-gaap_Revenues	$ 10,385us-gaap_Revenues	$ 8,116us-gaap_Revenues	$ 6,869us-gaap_Revenues	$ 5,707us-gaap_Revenues	$ 6,934us-gaap_Revenues	$ 4,623us-gaap_Revenues	$ 45,870us-gaap_Revenues	$ 24,133us-gaap_Revenues	$ 21,655us-gaap_Revenues
Expenses	19,421us-gaap_OperatingExpenses	20,071us-gaap_OperatingExpenses	17,432us-gaap_OperatingExpenses	15,727us-gaap_OperatingExpenses	15,043us-gaap_OperatingExpenses	11,866us-gaap_OperatingExpenses	12,402us-gaap_OperatingExpenses	11,528us-gaap_OperatingExpenses	72,651us-gaap_OperatingExpenses	50,839us-gaap_OperatingExpenses	43,853us-gaap_OperatingExpenses
Net loss	$ (4,319)us-gaap_NetIncomeLoss	$ (7,545)us-gaap_NetIncomeLoss	$ (6,981)us-gaap_NetIncomeLoss	$ (7,572)us-gaap_NetIncomeLoss	$ (8,144)us-gaap_NetIncomeLoss	$ (6,145)us-gaap_NetIncomeLoss	$ (5,450)us-gaap_NetIncomeLoss	$ (6,885)us-gaap_NetIncomeLoss	$ (26,417)us-gaap_NetIncomeLoss	$ (26,624)us-gaap_NetIncomeLoss	$ (22,264)us-gaap_NetIncomeLoss
Net loss per share	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.11)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.10)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.12)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.11)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.10)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.39)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.48)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.42)us-gaap_EarningsPerShareBasicAndDiluted

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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