Organization and Significant Accounting Policies - Summary of Revenue Disaggregated by Segment, Product and Geography Based on Management's Assessment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 2,321	$ 3,038	$ 4,539	$ 5,671
Biomedical Market [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 1,850	$ 2,650	$ 3,639	$ 4,786
% of Total Revenues	100.00%	100.00%	100.00%	100.00%
Biomedical Market [Member] | U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 1,643	$ 2,471	$ 3,216	$ 4,277
Biomedical Market [Member] | OUS [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	207	179	423	509
Biomedical Market [Member] | Cells [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 369	$ 367	$ 641	$ 751
% of Total Revenues	20.00%	14.00%	18.00%	16.00%
Biomedical Market [Member] | Cells [Member] | U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 283	$ 304	$ 455	$ 547
Biomedical Market [Member] | Cells [Member] | OUS [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	86	63	186	204
Biomedical Market [Member] | Media [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 1,478	$ 2,278	$ 2,995	$ 4,021
% of Total Revenues	80.00%	86.00%	82.00%	84.00%
Biomedical Market [Member] | Media [Member] | U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 1,357	$ 2,162	$ 2,758	$ 3,716
Biomedical Market [Member] | Media [Member] | OUS [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	121	116	237	305
Biomedical Market [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	3	$ 5	3	$ 14
% of Total Revenues		0.00%		0.00%
Biomedical Market [Member] | Other [Member] | U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	3	$ 5	3	$ 14
Cosmetic Market [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 471	$ 388	$ 900	$ 885
% of Total Revenues	100.00%	100.00%	100.00%	100.00%
Cosmetic Market [Member] | Ecommerce [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 225	$ 238	$ 440	$ 571
% of Total Revenues	48.00%	61.00%	49.00%	65.00%
Cosmetic Market [Member] | Professional [Member]
Disaggregation Of Revenue [Line Items]
Total Revenues	$ 246	$ 150	$ 460	$ 314
% of Total Revenues	52.00%	39.00%	51.00%	35.00%