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Stockholders' Equity - Narrative (Details) - Securities Purchase Agreement $ / shares in Units, $ in Millions	Oct. 09, 2018 USD ($) $ / shares shares
Class Of Stock [Line Items]
Purchase price per share	$ 2.35
Conversion of preferred stock to common stock | shares	866,950
Thomas B. Pickens III | Preferred Shares
Class Of Stock [Line Items]
Shares agreed to sell upon agreement | shares	866,950
Preferred stock, par value	$ 0.001
Common Stock | Other Investor
Class Of Stock [Line Items]
Shares agreed to sell upon agreement | shares	409,645
Common stock, par value	$ 0.001
Purchase price per share	$ 2.35
Aggregate gross proceeds from agreement on sale of shares | $	$ 3.0

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