Trade Receivables, Net (Tables)

12 Months Ended

Dec. 31, 2019

Trade and other receivables [abstract]

Schedule of trade receivables, net

	December 31,
	2019			2018
Open accounts (1)	$	6,279		$	3,165
Credit cards		158			74
Less—allowance for doubtful accounts		(930	)		(335	)
Trade receivables, net	$	5,507		$	2,904

(1) Trade receivables generally have 90 day credit terms. Certain customers payments are made through monthly credit card transactions.

Schedule of allowance for doubtful account

	U.S. dollars in thousands
Balance as of January 1, 2018	$	288
Provision for the year		335
Derecognition of bad debts		(249	)
Reversal in respect of collected doubtful accounts		(39	)
Balance as of December 31, 2018		335
Provision for the year		835
Derecognition of bad debts		(240	)
Reversal in respect of collected doubtful accounts		—
Balance as of December 31, 2019	$	930

Schedule of credit losses exposure

December 31, 2019:
	U.S. dollars in thousands
	Not past due		< 30 days		30 - 60 days		61 - 90 days		91 - 120 days		>120 days		Total
	U.S. dollars in thousands
Gross carrying amount	$	2,619	$	1,133	$	544	$	461	$	247	$	1,433	$	6,437
Allowance for doubtful accounts	$	7	$	11	$	8	$	32	$	69	$	803	$	930
Trade receivables, net		2,612		1,122		536		429		178		630	$	5,507

December 31, 2018:
	U.S. dollars in thousands
	Not past due		< 30 days		30 - 60 days		61 - 90 days		91 - 120 days		>120 days		Total
	U.S. dollars in thousands
Gross carrying amount	$	1,210	$	953	$	207	$	305	$	266	$	298	$	3,239
Allowance for doubtful accounts	$	148	$	39	$	12	$	23	$	23	$	90	$	335
Trade receivables, net		1,062		914		195		282		243		208	$	2,904