Common Stock and Preferred Stock - Additional Information (Detail)					1 Months Ended					3 Months Ended				6 Months Ended
		Jul. 09, 2020 $ / shares	Aug. 09, 2019 USD ($) $ / shares shares	Jan. 01, 2019 shares	Jun. 30, 2020 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) ExecutiveOfficers shares	Aug. 31, 2019 shares	Jan. 31, 2019 USD ($) ExecutiveOfficers director shares	Jun. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) ExecutiveOfficers shares	Jun. 30, 2019 USD ($) shares	Mar. 31, 2019 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares					$ 0.001					$ 0.001				$ 0.001		$ 0.001
Shares vested | shares							16,417
Common stock issued in the period (in shares) | shares			585,300
Restricted stock grants			$ 4,200,000
Dividends										$ 0		$ 0		$ 0	$ 0
Preferred stock, shares issued (in shares) | shares			200,000		200,000					200,000				200,000		200,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001					$ 0.001				$ 0.001		$ 0.001
Preferred shares outstanding (in shares) | shares					200,000					200,000				200,000		200,000
Initial value per share (in dollars per share) | $ / shares			$ 100
Preferred stock quarterly dividend rate										6.00%
Preferred stock dividend										$ 312,000		$ 0		$ 619,000	0
Number of shares outstanding in which, one director may be elected | shares			50,000
Voting percentage required to change number of directors			80.00%
Payment-in-kind interest														$ 2,277,000	$ 0
Conversion of convertible senior notes	[1]									9,473,000
3.25% Convertible Senior Notes (due 2020)
Class of Stock [Line Items]
Debt converted, amount					$ 7,100,000
Payment-in-kind interest					200,000
Subsequent Event
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.001
Stock split conversion ratio		0.1
Restricted Stock
Class of Stock [Line Items]
Shares vested (in shares) | shares						10,936								69,440
Value of shares surrendered										$ 163,000	$ 270,000
Stock forfeited (in shares) | shares											26,214
Executive officer
Class of Stock [Line Items]
Restricted stock issued (in shares) | shares								306,122
Restricted stock issued, value								$ 4,500,000
Number of executive officers | ExecutiveOfficers								2			2
Executive officer | Restricted Stock
Class of Stock [Line Items]
Restricted stock issued (in shares) | shares						70,421
Restricted stock issued, value						$ 700,000
Number of executive officers | ExecutiveOfficers						2
Shares surrendered (in shares) | shares											16,640	2,428	16,670
Value of shares surrendered											$ 172,000	$ 25,000	$ 249,000
Vesting period						4 years
Non-employee directors
Class of Stock [Line Items]
Restricted stock issued (in shares) | shares								32,823
Restricted stock issued, value								$ 500,000
Number of non-employee directors | director								6
Non-employee directors | Restricted Stock
Class of Stock [Line Items]
Restricted stock issued (in shares) | shares				5,470
Employee | Restricted Stock
Class of Stock [Line Items]
Shares surrendered (in shares) | shares										246
Value of shares surrendered										$ 1,526
Redeemable Preferred Stock
Class of Stock [Line Items]
Dividends														$ 0
Dividends payable					1,100,000					1,100,000				$ 1,100,000
Minimum
Class of Stock [Line Items]
Preferred stock, liquidation preference percent			20.00%
Minimum | Restricted Stock
Class of Stock [Line Items]
Vesting period														1 year
Maximum
Class of Stock [Line Items]
Preferred stock, liquidation preference percent			150.00%
Maximum | Restricted Stock
Class of Stock [Line Items]
Vesting period														5 years
Fair Value Measurements, Recurring | Redeemable Preferred Stock | Level 3
Class of Stock [Line Items]
Estimated fair value of liability			$ 4,900,000		$ 3,164,000					3,164,000				$ 3,164,000		$ 5,247,000
Common Stock
Class of Stock [Line Items]
Stock repurchased (in shares) | shares									311,284
Share price (in dollars per share) | $ / shares									$ 77.10
Stock repurchased									$ 24,000,000.0
Conversion of convertible senior notes	[1]									$ 1,000
Common Stock | 3.25% Convertible Senior Notes (due 2020)
Class of Stock [Line Items]
Debt instrument shares common stock issued upon conversion (in shares) | shares					710,100
Conversion of convertible senior notes					$ 9,500,000

[1] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.