Subsequent Events	9 Months Ended
Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 16, 2019, the Company obtained a waiver letter (the “Waiver Letter”) from Innovatus, with respect to certain financial covenants under the Innovatus LSA. Pursuant to the Waiver Letter, Innovatus agreed to allow the Company to cure its noncompliance with a revenue covenant for the three months ended September 30, 2019 so long as the Company (i) raised at least $10 million in gross proceeds from the sale of its securities in an underwritten public offering by October 31, 2019 and (ii) amended that certain Warrant to Purchase Stock, issued by the Company to Innovatus on March 22, 2019 (the "Innovatus Warrant"), to decrease the exercise price of the warrant from $4.63 per share to $0.48 per share. As consideration for the prospective waiver of a liquidity covenant, the Company agreed to issue to Innovatus 572,917 shares of the Company's common stock, and the Company plans to issue such shares of common stock to Innovatus in the near future. On October 23, 2019, the Company completed an underwritten public offering of 10,013,600 shares of its common stock and, to certain investors, pre-funded warrants to purchase 10,923,958 shares of its common stock, and accompanying common warrants to purchase up to an aggregate of 20,937,558 shares of its common stock. Each share of common stock and pre-funded warrant to purchase one share of common stock was sold together with a common warrant to purchase one share of common stock. The public offering price of each share of common stock and accompanying common warrant was $0.86 and $0.859 for each pre-funded warrant and accompanying common warrant. The pre-funded warrants are immediately exercisable at a price of $0.001 per share of common stock. The common warrants are immediately exercisable at a price of $0.86 per share of common stock and will expire five years from the date of issuance. The shares of common stock and pre-funded warrants, and the accompanying common warrants, were issued separately and were immediately separable upon issuance. The gross proceeds to the Company, before deducting underwriting discounts and commissions and other offering expenses, were approximately $18.0 million. On October 30, 2019, the Company amended the Innovatus Warrant pursuant to the terms of the Waiver Letter.

Subsequent Events

On October 16, 2019, the Company obtained a waiver letter (the “Waiver Letter”) from Innovatus, with respect to certain financial covenants under the Innovatus LSA. Pursuant to the Waiver Letter, Innovatus agreed to allow the Company to cure its noncompliance with a revenue covenant for the three months ended September 30, 2019 so long as the Company (i) raised at least $10 million in gross proceeds from the sale of its securities in an underwritten public offering by October 31, 2019 and (ii) amended that certain Warrant to Purchase Stock, issued by the Company to Innovatus on March 22, 2019 (the "Innovatus Warrant"), to decrease the exercise price of the warrant from $4.63 per share to $0.48 per share. As consideration for the prospective waiver of a liquidity covenant, the Company agreed to issue to Innovatus 572,917 shares of the Company's common stock, and the Company plans to issue such shares of common stock to Innovatus in the near future.

On October 23, 2019, the Company completed an underwritten public offering of 10,013,600 shares of its common stock and, to certain investors, pre-funded warrants to purchase 10,923,958 shares of its common stock, and accompanying common warrants to purchase up to an aggregate of 20,937,558 shares of its common stock. Each share of common stock and pre-funded warrant to purchase one share of common stock was sold together with a common warrant to purchase one share of common stock.

The public offering price of each share of common stock and accompanying common warrant was $0.86 and $0.859 for each pre-funded warrant and accompanying common warrant. The pre-funded warrants are immediately exercisable at a price of $0.001 per share of common stock. The common warrants are immediately exercisable at a price of $0.86 per share of common stock and will expire five years from the date of issuance. The shares of common stock and pre-funded warrants, and the accompanying common warrants, were issued separately and were immediately separable upon issuance. The gross proceeds to the Company, before deducting underwriting discounts and commissions and other offering expenses, were approximately $18.0 million.

On October 30, 2019, the Company amended the Innovatus Warrant pursuant to the terms of the Waiver Letter.