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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended
	Mar. 29, 2019	May 23, 2019	Jun. 06, 2019	Jan. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Debt instrument, principal face amount					$ 4,500,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock subscription price per share				$ 1.75
Interest rate on promissory note		8.00%	8.00%
Aggregate borrowed amount		$ 3,300,000
Debt instrument, principal face amount		$ 3,300,000	$ 2,000,000
Maturity period		6 months
Subsequent Event [Member] | Pre-Funded Series D Warrants [Member]
Subsequent Event [Line Items]
Shares issuable upon warrants exercised				7.9
Number of warrants available for cancellation			53.4
Subsequent Event [Member] | Series D Warrants [Member]
Subsequent Event [Line Items]
Number of warrants available for cancellation			3.9
Subsequent Event [Member] | Series D Preferred Shares [Member]
Subsequent Event [Line Items]
Preferred stock, stated value	$ 1,160,000
Proceeds from exchanage of preferred stock	400,000
Issuance of senior secured promissory note in exchange of preferred stock	$ 1,560,000
Interest rate on promissory note	8.00%
Maturity date	Apr. 01, 2020
Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Common stock subscription price				$ 50,000,000

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- Definition

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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Monetary value of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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