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Net Loss per Common Share - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Jun. 30, 2018

Jun. 30, 2017

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Earnings Per Share [Abstract]

Net loss

$ (6,658)

$ (19,246)

$ (12,596)

$ (1,943)

$ (11,332)

$ (8,486)

$ (1,004)

$ (6,667)

$ (1,813)

$ 527

$ (13,276)

$ (45,117)

$ (17,971)

$ (14,704)

Preferred stock dividends

(527)

Net income (loss) - basic

527

(13,276)

$ (45,644)

$ (17,971)

$ (14,704)

Adjustment for gain on warrant income

(619)

Net loss per share - basic and diluted

^[1]

$ (3,250)

$ (1,853,500)

$ (2,548,000)

Net loss - diluted

$ (92)

$ (13,276)

Weighted average shares outstanding - basic and diluted

^[1]

14,039

10

6

Weighted average shares outstanding - basic

^[2]

916,706

1,416

788,512

848

Weighted average shares outstanding - diluted

^[2]

916,706

1,416

799,430

848

Net income (loss) per share - basic

$ (7.26)

^[2]

$ 375

$ 4,680

$ (1,373.00)

^[2]

$ 43,750

$ 646,010

$ 115,495

$ 771,750

$ 218,750

$ 0.67

^[2]

$ (15,656.00)

^[2]

Net income (loss) per share - diluted

^[2]

$ (7.26)

$ (1,373.00)

$ (0.12)

$ (15,656.00)

[1]	reflects a one-for-sixteen (1:16) reverse stock split effected on July 21, 2016, a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.
[2]	reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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