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Additional common stocks under shelf registration.

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Combination of securities authorized for offer and sale.

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Sale of stock price per share net of fees.

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Stock option exercisable period.

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Stockholders equity during period issuance of common stock from warrant exercises.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The cash inflow from the additional capital contribution to the entity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Date the equity-based award expires, in CCYY-MM-DD format.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Number of new stock issued during the period.

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Stockholders' Equity - Preferred Stock and Common Stock - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended			28 Months Ended
	Oct. 20, 2016	Jun. 18, 2015	Nov. 30, 2013	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017	Apr. 24, 2017	Oct. 25, 2016	Aug. 31, 2015	Feb. 27, 2015	Aug. 31, 2013	Jul. 17, 2013	Jan. 31, 2012	May 31, 2008
Class Of Stock [Line Items]
Preferred stock, shares authorized				25,000,000			25,000,000
Preferred stock, shares outstanding				0			0
Issuance of common stock from stock options exercises, net, Shares				245,271	116,001	205,033
Issuance of common stock				104,551,466	92,391,989		104,551,466
Common stock, par value				$ 0.001	$ 0.001		$ 0.001
Issuance of common stock from warrant exercises, net, Shares				700,379	32,914	210,600
Warrants exercised				822,903	43,796	211,647
Stock option exercised				245,271	116,001	205,684
Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Value of shares sold under equity distribution agreement				$ 0	$ 0	$ 16,100,000
Issuance of common stock from stock options exercises, net, Shares				0	0	2,197,768
Equity Offering Sales Agreement [Member]
Class Of Stock [Line Items]
Value of shares sold under equity distribution agreement				$ 4,600,000	$ 0	$ 6,200,000	$ 10,800,000
Issuance of common stock from stock options exercises, net, Shares				997,181	0	1,000,000
Issuance of common stock				1,997,181			1,997,181
Additional common stocks under shelf registration				$ 21,900,000			$ 21,900,000
2015 Underwriting Agreement [Member]
Class Of Stock [Line Items]
Stock option exercisable, period		30 days
Additional common stock issued on exercise of option by underwriters		1,413,750
Maximum [Member] \| Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Number of shares to be offered and sold in equity distribution agreement			4,000,000
IPO [Member]
Class Of Stock [Line Items]
Securities authorized for offer and sale, amount											$ 190,000,000		$ 100,000,000
Secondary Offering \| 2015 Underwriting Agreement [Member]
Class Of Stock [Line Items]
Issuance of common stock from stock options exercises, net, Shares		10,838,750
Common stock, par value		$ 0.001
Offering price per share		$ 4.25
Gross proceeds from sale of common stock shares		$ 43,100,000
Secondary Offering \| 2016 Underwriting Agreement [Member]
Class Of Stock [Line Items]
Offering price per share	$ 2.75
Gross proceeds from sale of common stock shares	$ 25,700,000
Over Allotment Option [Member] \| 2015 Underwriting Agreement [Member]
Class Of Stock [Line Items]
Issuance of common stock		9,425,000
Sale of stock price per share net of fees		$ 3.995
Over Allotment Option [Member] \| 2016 Underwriting Agreement [Member]
Class Of Stock [Line Items]
Issuance of common stock									10,065,000
Sale of stock price per share net of fees	$ 2.585
Equity Incentive Plan 2008 [Member]
Class Of Stock [Line Items]
Common shares authorized to be issued															1,521,584
Termination date of equity incentive plan				Jul. 01, 2018
Shares issued during the year				0
Equity Incentive Plan 2012 [Member]
Class Of Stock [Line Items]
Common shares authorized to be issued										6,000,000		5,000,000		6,553,986
Shares available for issuance				3,617,386			3,617,386			17,553,986
Termination period of Equity Incentive Plan				10 years
Inducement Award Agreements [Member] \| Subsequent Event [Member]
Class Of Stock [Line Items]
Common shares authorized to be issued								2,297,034