Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Aug. 05, 2019	Apr. 10, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance			14,945,281
Stock repurchase program, authorized amount	$ 25,000
Stock repurchase program expiration date	Aug. 05, 2020
Stock repurchased during period, shares			1,930,414
Shares repurchase price per share			$ 4.86
Stock repurchase program, remaining authorized repurchase amount			$ 15,556
Shares of common stock issued		3,450,000
Net proceeds received after deducting underwriters' discounts and commissions and offering costs				$ 27,967	$ 15,000
Underwriters' Option [Member]
Class Of Stock [Line Items]
Shares of common stock issued		450,000
Purchase price per share		$ 8.60
Net proceeds received after deducting underwriters' discounts and commissions and offering costs		$ 28,000
Series A Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, shares authorized			1,000,000	1,000,000
Preferred Stock, shares issued			40,624	39,442
Preferred Stock, shares outstanding			40,624	39,442
Preferred stock dividend percentage received			4.00%
Preferred stock redemption price paid			$ 10.00
Preferred stock dividends issued			1,182	1,898
Dividends in arrears			$ 8
Preferred stock convertible into common stock			1.66611
Preferred Stock, par value			$ 0.001	$ 0.001
Preferred stock voting rights			Each share of the Series A convertible preferred stock is entitled to one vote for each share of common stock into which the preferred stock is convertible.
Preference of preferred stock			$ 10.00
Preferred stock redemption period			Two years
Series A Convertible Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Preferred Stock, par value			$ 11.20
Series A Convertible Preferred Stock [Member] | StarTrak Systems LLC [Member]
Class Of Stock [Line Items]
Preferred Stock, shares issued			183,550
Preferred Stock, shares outstanding			40,624
Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, shares authorized			50,000,000