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Common Stock and Preferred Stock - Additional Information (Detail)	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2019 USD ($) director shares	Jan. 31, 2018 USD ($) ExecutiveOfficers shares	Mar. 31, 2019 USD ($) ExecutiveOfficers shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) shares
Class of Stock [Line Items]
Dividends			$ 0	$ 0
Executive officer
Class of Stock [Line Items]
Restricted stock issued (in shares) | shares	3,061,224	1,914,894
Restricted stock issued, value	$ 4,500,000	$ 4,500,000
Number of executive officers	2	2	2
Executive officer | Restricted Stock
Class of Stock [Line Items]
Vesting period		3 years
Shares surrendered (in shares) | shares			143,913		42,346
Value of shares surrendered			$ 215,000		$ 98,000
Non-employee directors
Class of Stock [Line Items]
Restricted stock issued (in shares) | shares	328,230	249,480
Restricted stock issued, value	$ 500,000	$ 600,000
Number of non-employee directors | director	6

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