Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Changes in the Allowance for Doubtful Accounts

The following table presents our allowance for doubtful accounts activity for the periods indicated (in thousands):


	December 31,
	2019		2018		2017

Balance at beginning of period	$	153	$	303	$	225
Charges to costs and expenses	26		43		137
Deductions	(38)		(193)		(59)
Balance at end of period	$	141	$	153	$	303

Summary of Cash and Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash and cash equivalents and restricted cash as reported in the consolidated balance sheets that totals to the amounts shown in the consolidated statements of cash flows (in thousands):


	December 31,
	2019		2018

Cash and cash equivalents	$	112,994	$	117,066
Restricted cash	9,261		—
Total cash, cash equivalents and restricted cash shown in the
consolidated statements of cash flows	$	122,255	$	117,066

Schedule of Common Stock

The following table reconciles our outstanding common stock for the periods indicated:


						Common
						shares

Balance, December 31, 2017 and 2018						4,217,596
Issuance of shares in acquisition (see Note 7)						11,145
Vesting of restricted stock unit awards (see Note 14)						7,604
Shares withheld to cover taxes upon vesting of restricted stock unit awards						(883)
Other						71
Balance, December 31, 2019						4,235,533

Schedule of Earnings per Share, Basic and Diluted

A reconciliation of the calculation of basic and diluted earnings (losses) per share was as follows for the periods indicated (in thousands, except per share data):


	Year Ended December 31,
	2019		2018		2017
Earnings (losses) per share – numerator:
Net (losses) earnings	$	8,207	$	2,945	$	(482)

Denominator:
Basic weighted average number of shares outstanding	4,228		4,218		4,218
Basic earnings (losses) per share	$	1.94	$	0.70	$	(0.11)

Diluted earnings (losses) per share:

Diluted weighted average number of shares outstanding:
Common shares	4,228		4,218		4,218
Restricted stock unit awards ⁽¹⁾	5		—		—
Performance share unit awards ⁽²⁾	—		—		—
Total	4,233		4,218		4,218

Diluted earnings (losses) per share	$	1.94	$	0.70	$	(0.11)

_______________

(1)The dilutive effect of restricted stock unit awards for the year ended December 31, 2018 is de minimis.

(2)The dilutive effect of performance share awards are included in the calculation of diluted earnings per share when the performance share award performance conditions have been achieved. The performance conditions for the performance share unit awards granted in 2018 and 2019 were achieved as of December 31, 2018 and 2019, respectively. For the years ended December 31, 2019 and 2018, the effects of the performance share awards on earning per share were anti-dilutive.

Schedule of Cost of Retirement Plans

Our 401(k) plan contributory expenses were as follows for the periods indicated (in thousands):


	Year Ended December 31,
	2019		2018		2017

Contributory expenses	$	1,117	$	808	$	734