Financial instruments - Summary of Short-Term Investments and Long-Term Investments of Available-for-Sale Securities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized cost	$ 24,195,303	$ 2,820,600
Due within one year, Fair value	24,191,219	2,820,600
Due after one year through two years, Amortized cost	2,002,870
Due after one year through two years, Fair value	2,003,099
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	24,195,303
Gross unrealized gains	1,354
Gross unrealized losses	(5,438)
Fair value	24,191,219
Short-term investments [Member] \| U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	12,199,357
Gross unrealized losses	(5,438)
Fair value	12,193,919
Short-term investments [Member] \| U.S. government agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	11,995,946
Gross unrealized gains	1,354
Fair value	11,997,300
Short-term investments [Member] \| Bank guaranteed investment certificate [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		2,820,600
Fair value		2,820,600
Long-term investments [Member] \| U.S. government agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,002,870
Gross unrealized gains	229
Fair value	$ 2,003,099

Available For Sale Securities Debt Maturities After One Through Two Years Amortized Cost

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- Definition

Available For Sale Securities Debt Maturities After One Through Two Years Fair Value

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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